Republican presidential candidate Jeb Bush speaks to an audience of voters on February 18, 2016 in Columbia, South Carolina.
Spencer Platt/Getty Images
Republican presidential candidate Jeb Bush speaks to an audience of voters on February 18, 2016 in Columbia, South Carolina.
Now playing
01:22
Jeb Bush: 'I will not vote for Donald Trump'
Green Party presidential nominee Jill Stein waits to be introduced prior to a press conference at the National Press Club August 23, 2016 in Washington, DC.
Win McNamee/Getty Images
Green Party presidential nominee Jill Stein waits to be introduced prior to a press conference at the National Press Club August 23, 2016 in Washington, DC.
Now playing
01:44
Jill Stein raises millions for recount
Former Democratic US Presidential candidate Hillary Clinton speaks to staff and supporters at the New Yorker hotel after her defeat in the presidential election November 9, 2016 in New York. / AFP / Brendan Smialowski        (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)
BRENDAN SMIALOWSKI/AFP/Getty Images
Former Democratic US Presidential candidate Hillary Clinton speaks to staff and supporters at the New Yorker hotel after her defeat in the presidential election November 9, 2016 in New York. / AFP / Brendan Smialowski (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)
Now playing
02:14
Scientists urge Clinton to call for recount
LYNDEN, WA - MAY 07: Republican presidential candidate Donald Trump gives a speech during a rally at the The Northwest Washington Fair and Event Center on May 7, 2016 in Lynden, Washington. Trump became the Republican presumptive nominee following his landslide win in Indiana on Tuesday. (Photo by Matt Mills McKnight/Getty Images)
Matt Mills McKnight/Getty Images North America/Getty Images
LYNDEN, WA - MAY 07: Republican presidential candidate Donald Trump gives a speech during a rally at the The Northwest Washington Fair and Event Center on May 7, 2016 in Lynden, Washington. Trump became the Republican presumptive nominee following his landslide win in Indiana on Tuesday. (Photo by Matt Mills McKnight/Getty Images)
Now playing
03:25
Donald Trump's wild ride
Now playing
01:46
Trump's challenges in the Middle East
donald trump undocumented immigrants crime fact check origwx ty_00013807.jpg
donald trump undocumented immigrants crime fact check origwx ty_00013807.jpg
Now playing
02:47
Fact checking Trump on crimes by immigrants
Mark Makela/Getty Images/Lintao Zhang/Getty Images
Now playing
01:26
Trump vs. the tape on Obama and the protester
Now playing
01:28
Trump compares Clinton email probe to Watergate
Members of the Secret Service rush Republican presidential candidate Donald Trump off the stage at a campaign rally in Reno, Nev., on Saturday, Nov. 5, 2016. (AP Photo/John Locher)
John Locher/AP
Members of the Secret Service rush Republican presidential candidate Donald Trump off the stage at a campaign rally in Reno, Nev., on Saturday, Nov. 5, 2016. (AP Photo/John Locher)
Now playing
01:20
Donald Trump rushed off stage by Secret Service
AFP/Getty Images
Now playing
02:16
Trump reads letter from Patriot's coach at rally
US Republican presidential nominee Donald Trump speaks during rally at the Atkinson Country Club in Atkinson, New Hampshire on November 4, 2016.
Mandel Ngan/AFP/Getty Images
US Republican presidential nominee Donald Trump speaks during rally at the Atkinson Country Club in Atkinson, New Hampshire on November 4, 2016.
Now playing
01:56
Trump on US officials: 'What a group of losers'
donald trump nice and cool pensacola fl bts_00001523.jpg
donald trump nice and cool pensacola fl bts_00001523.jpg
Now playing
00:49
Trump's mantra in campaign's final week: Stay on point
donald trump nice to hillary clinton and democrats orig cm_00000000.jpg
donald trump nice to hillary clinton and democrats orig cm_00000000.jpg
Now playing
01:52
Audio of Trump praising the Clintons and Democrats
cuomo lewandowski hillary clinton email exchange newday_00002327.jpg
cuomo lewandowski hillary clinton email exchange newday_00002327.jpg
Now playing
01:28
Cuomo grills Lewandowski on Clinton email 'hypocrisy'
Now playing
01:49
Meet the other Hillary Clinton and Donald Trump

Story highlights

Jeb Bush is carrying his crusade against Donald Trump to the doorstep of the Republican convention

Bush also actively floated supporting the Libertarian ticket in the fall

(CNN) —  

Jeb Bush is carrying his crusade against Donald Trump to the doorstep of the Republican convention, saying that he is not the future of the Republican Party even as it prepares to nominate him.

Bush, once seen as the front-runner for the Republican presidential nomination, remains one of the most prominent anti-Trump holdouts in the GOP. In an op-ed for The Washington Post published Friday, Bush acknowledged that Trump had capitalized on legitimate frustrations with American politics.

“They have given rise to the success of a candidate who continues to grotesquely manipulate the deeply felt anger of many Americans,” Bush wrote, saying the nominee harkened back to an 1850s political party. “Trump’s abrasive, Know Nothing-like nativist rhetoric has blocked out sober discourse about how to tackle America’s big challenges.”

Bush’s op-ed continues his vehement opposition to Trump. During the primaries, he and Trump regularly traded shots on the campaign trail, with the real estate mogul memorably labeling him “low-energy.” After Bush dropped out following the South Carolina primary, he vowed that he would not vote for Trump and does not plan to attend the Republican National Convention.

Later Friday, he offered a backhanded compliment of Trump’s decision to choose Indiana Gov. Mike Pence as his running mate, tweeting, “Mike Pence is a good man. He will add value to the ticket.”

In his op-ed, the former Florida governor implored Republicans to protect their control of Congress, and called on the party to “reintroduce civility, ideas and optimism back into politics. Let’s find ways to campaign and govern inclusively. Let’s find ways to ease the angst and fear of people, without cynically feeding it.”

Bush, a lifelong Republican from a family that produced two Republican presidents, also floated the idea of supporting the Libertarian ticket in the fall.

“I haven’t decided how I’ll vote in November – whether I’ll support the Libertarian ticket or write in a candidate – but I do know there are a lot of things Republicans can do in the coming months to lay the groundwork for rebuilding our party and the foundation for a true conservative renewal in our country.”

Bush isn’t the first anti-Trump Republican to suggest that he might vote Libertarian this fall. Last month, 2012 GOP nominee Mitt Romney also said he would consider voting for the Libertarian ticket, though he noted he had policy differences with them.

The Republican National Convention begins Monday in Cleveland.