WASHINGTON, DC - JULY 29: House Speaker John Boehner holds his weekly news conference on Capitol Hill on July 29, 2015 in Washington, DC. During the press conference the Speaker listed the accomplishments of the Republican party that saved US tax payers trillions of dollars, but admitted much more needs to be done. (Photo by Astrid Riecken/Getty Images)
Astrid Riecken/Getty Images/FILE
WASHINGTON, DC - JULY 29: House Speaker John Boehner holds his weekly news conference on Capitol Hill on July 29, 2015 in Washington, DC. During the press conference the Speaker listed the accomplishments of the Republican party that saved US tax payers trillions of dollars, but admitted much more needs to be done. (Photo by Astrid Riecken/Getty Images)
Now playing
02:14
GOP leaders react to Speaker Boehner's resignation
Speaker of the House John Boehner, tells reporters that he is "cleaning out the barn, cleaning out the barn," as he heads to a GOP conference meeting at the begining of his last week in the House of Representatives October 26 in Washington, DC. The White House and Boehner may be nearing a two-year budget deal that would avert another government shutdown, increase defense and defense spending by $80 billion and extend the debt limit through to March 2017, clearing it away until after the 2016 elections.
Chip Somodevilla/Getty Images
Speaker of the House John Boehner, tells reporters that he is "cleaning out the barn, cleaning out the barn," as he heads to a GOP conference meeting at the begining of his last week in the House of Representatives October 26 in Washington, DC. The White House and Boehner may be nearing a two-year budget deal that would avert another government shutdown, increase defense and defense spending by $80 billion and extend the debt limit through to March 2017, clearing it away until after the 2016 elections.
Now playing
00:49
Boehner: There is no Republican Party
House Speaker John Boehner announces his resignation during a press conference on Capitol Hill September 25, 2015 in Washington, D.C.
Astrid Riecken/Getty Images
House Speaker John Boehner announces his resignation during a press conference on Capitol Hill September 25, 2015 in Washington, D.C.
Now playing
01:08
John Boehner joins board of cannabis company
WASHINGTON, DC - SEPTEMBER 25:  Speaker of the House John Boehner (R-OH) announces that he is retiring from the House and stepping down as Speaker at the end of October during a news conference at the U.S. Capitol September 25, 2015 in Washington, DC. After 25 years in Congress and five years as Speaker, Boehner said he decided this morning to step down after contemplation and prayer.  (Photo by Chip Somodevilla/Getty Images)
Chip Somodevilla/Getty Images
WASHINGTON, DC - SEPTEMBER 25: Speaker of the House John Boehner (R-OH) announces that he is retiring from the House and stepping down as Speaker at the end of October during a news conference at the U.S. Capitol September 25, 2015 in Washington, DC. After 25 years in Congress and five years as Speaker, Boehner said he decided this morning to step down after contemplation and prayer. (Photo by Chip Somodevilla/Getty Images)
Now playing
01:24
Boehner: Trump presidency a complete disaster
John Boehner repeal replace obamacare_00010923.jpg
HIMSS
John Boehner repeal replace obamacare_00010923.jpg
Now playing
00:58
Boehner: GOP will never replace Obamacare
John Boehner resigns congress_00000000.jpg
John Boehner resigns congress_00000000.jpg
Now playing
02:29
House Speaker John Boehner resigns
pelosi boehner resignation sot_00002111.jpg
pelosi boehner resignation sot_00002111.jpg
Now playing
00:59
Pelosi: Boehner is 'a very fine person'
House Speaker John Boehner kisses House Minority Leader Nancy Pelosi during a reception in the Rose Garden of the White House on April 21, 2015.
MANDEL NGAN/AFP/Getty Images
House Speaker John Boehner kisses House Minority Leader Nancy Pelosi during a reception in the Rose Garden of the White House on April 21, 2015.
Now playing
01:07
Some of the best Boehner moments
CNN
Now playing
00:46
John Boehner chokes up during resignation
Now playing
00:49
Speaker Boehner's army of volunteers
pope francis congress tears moos pkg erin _00005523.jpg
pope francis congress tears moos pkg erin _00005523.jpg
Now playing
02:08
Congress gets emotional during Pope Francis' visit
CNN/Pool
Now playing
03:21
Obama: John Boehner is a good man
john boehner resign nancy pelosi sot_00000419.jpg
john boehner resign nancy pelosi sot_00000419.jpg
Now playing
02:25
Pelosi: Boehner resignation 'seismic for the House'
Boehner Obama History_00001328.jpg
Boehner Obama History_00001328.jpg
Now playing
01:23
Obama and Boehner: A History
orig bw boehner bar_00002825.jpg
orig bw boehner bar_00002825.jpg
Now playing
00:50
6 times John Boehner talked about growing up in a bar

Story highlights

House Majority Leader Kevin McCarthy has had a meteoric rise in Congress

Tea party conservatives cheered Boehner's announcement

Rep. Tim Huelskamp says conservatives will rally around one candidate

(CNN) —  

John Boehner’s sudden resignation is launching an unexpected leadership battle in Congress that may be a turning point for Republicans, likely pitting the establishment wing against tea party conservatives.

The Ohio Republican, who has served as the Speaker of the House since 2011, told colleagues in a closed-door gathering Friday morning that he would leave at the end of October, sending shockwaves through the chamber.

Even as Boehner’s fellow lawmakers were still digesting the news, the speculation over who would succeed him had already begun. One person who is naturally next in line is House Majority Leader Kevin McCarthy, but this could be a moment for the tea party to make a splash.

Ohio GOP Rep. Steve Chabot, who described the mood in the room as “somber” and said there had been tears from Boehner, said the subject of who would replace the Speaker had not come up. But he predicted that this would begin in “five minutes.”

If McCarthy wins the gavel, it would mark the continuation of an incredible ascent for the California Republican, who has only held the second highest ranking job in the House since last summer. McCarthy himself was only said to have found out about Boehner’s resignation moments before Friday’s morning meeting.

During his press conference Friday afternoon, Boehner effectively endorsed McCarthy. “I am not going to be here to vote on the next Speaker. But that’s up to the next members. But having said that, I think that Kevin McCarthy would make an excellent Speaker,” Boehner said.

Two sources familiar with McCarthy’s lobbying efforts told CNN Friday night that they feel he’s in a good place to get the votes to become Speaker. He spent the whole day talking to people and will continue to talk to every single member of the GOP conference, the sources said.

Although he’s part of the “establishment” leadership, he has good relationships with many of the newer members, many of whom he helped recruit.

One of the sources said there’s going to be an effort to make sure House Republicans have a good understanding of who McCarthy is and where he came from, defining him before others can do it for him. The source cited accusations that he is pro-amnesty on immigration as an area in particular that they want to defend him over.

But McCarthy is expected to face a challenge for the speakership, though it’s unclear how serious that fight will be. The chamber’s conservative faction may instead choose to focus on winning another post – such as majority leader or whip – instead.

Among the lawmakers who could seek the majority leader spot are Reps. Steve Scalise of Louisiana (the current Whip), Cathy McMorris Rodgers of Washington state and Tom Price of Georgia.

Lawmakers react to Boehner’s announcement

Deputy Whip Patrick McHenry, R-North Carolina, is a leading candidate to be the next whip, and Rep. Markwayne Mullin of Oklahoma has also indicated he will seek the role.

Scalise held a conference call Friday night with his whip team to tell the House vote counters that he will run for majority leader if McCarthy were to become speaker, according to a source with knowledge of the call. As majority leader, Scalise said he would work with every Republican to advance conservative legislation, and said he would ensure the House took the steps to develop consensus within the caucus.

Scalise added that Boehner’s decision to resign was “one of the most selfless things I’ve ever seen.”

On Saturday, Rep. Peter Roskam, R-Illinois, called for a special conference meeting head of the vote for the next Speaker.

“Healing our divisions and uniting behind the conservative policy solutions the American people deserve will help our members and it will empower the new leaders we select,” he said in a letter to colleagues.

Roskam said he was not announcing a run for any leadership position, but several House Republicans said he is making calls and positioning to join the race for majority leader.

Opportunity for tea party conservatives

Boehner’s exit also creates an opening for the more conservative wing of the House caucus. Boehner has long faced intense pressure from his conservative colleagues to take more of an ideologically purist stance on divisive issues like Obamacare and the Export-Import Bank.

In October 2013, the government entered into a partial shutdown when lawmakers were deadlocked on funding the Affordable Care Act, exposing a deep divide within the GOP.

More recently, the issue of funding for Planned Parenthood has raised the alarm about another possible government shutdown. Conservative Republicans have sought to tie provisions to defund the organization to a government funding bill, amid outrage over videos that allegedly show officials from the group discussing the sale of fetal tissue.

President Barack Obama addressed Boehner’s resignation during a press conference with Chinese President Xi Jin Ping Friday afternoon.

Obama said Boehner was a leader who understood that in governance, “you don’t get 100% of what you want” – and called on the next speaker to not resort to shutting down the government when faced with significant differences in opinion.

When asked who will run for speaker, Rep. Tim Huelskamp, R-Kansas, said: “Everybody! But the establishment lost today.”

Huelskamp said he and other Tea Party Republicans were jubilant at the news of Boehner’s resignation and believes that hard-line conservatives, often splintered, would agree on a candidate together and not offer any early endorsements.

“He read the writing on the wall,” Huelskamp said. “We need new leadership. Every time we go home we hear, ‘Fire Boehner.’ We need a new speaker who can stand up to the president.”

RELATED: House Speaker John Boehner resigning from Congress at end of October

Rep. Raul Labrador, a favorite of conservatives who ran unsuccessfully for majority leader in January, declined to say Friday if he would run for Speaker. Several members of the House Freedom Caucus have pointed to Labrador as a possible candidate for Speaker or Majority Leader. Rep. Mark Meadows, R-North Carolina., who offered a resolution this summer that would have stripped Boehner of the Speaker’s gavel, told reporters Friday he would not run to succeed Boehner.

Rep. Paul Ryan, the chairman of the influential House Ways and Means Committee and the Mitt Romney’s vice presidential running mate in 2012, also will not run for the Speaker post, according to an aide.

Boehner’s resignation comes amid record-low public approval of Congress — and deep discontent with Boehner’s leadership.

An overwhelming 72% of Republican primary voters said they are dissatisfied with the ability of Boeher and Republican Senate Leader Mitch McConnell to achieve their party’s goals, according to a new NBC News/Wall Street Journal poll. In that survey, 36% said they want Boehner and McConnell immediately removed from their leadership positions.

Challenges a new leader will face

Texas GOP Rep Bill Flores said whoever follows Boehner will likely deal with the same political dynamic – fellow Republicans who will want to “take your head off.”

Flores said many House GOP members were frustrated with Senate Republicans for not pushing a more conservative agenda and voting on House-passed bills. “In my view the Speaker fell on his sword for all of Congress,” he said, “and I hope the Senate starts to get things done.”

Rep Lynn Westmoreland, R-Georgia, a Boehner ally, suggested the top post was a thankless job, asking, “who would want to be Speaker?”

He said he backed McCarthy, but said he didn’t think Boehner’s successor would have a much different impact on dealing with the divisions inside the conference.

“I think that the natives are restless and they want to see something change. So how much change somebody can bring about we’ll see,” Westmoreland said.

Westmoreland said he’s received multiple phone calls already from multiple candidates seeking the Majority Leader job, but hasn’t heard of anyone officially challenging McCarthy for Speaker.

California GOP Rep Devin Nunes told reporters he thought the leadership race could mean some new rules for how House Republicans operate. “You just can’t’ continue to have a super ultra-minority continue to try and dictate what happens in the House of Representatives,” he said.

CNN’s Manu Raju contributed to this report.