bash trump intv full origwx_00001016.jpg

Now playing

07:14

Trump: 'They are laughing at us back in Iran'

electioneering explainer danny cevallos orig_00001425.jpg

Now playing

01:13

States can actually limit free speech on Election Day

PHOTO: Justin Sullivan/Getty Images

U.S. Sen. Bernie Sanders (I-VT) speaks during a campaign rally with democratic presidential nominee former Secretary of State Hillary Clinton at University of New Hampshire on September 28, 2016 in Durham, New Hampshire.

Now playing

03:00

Remembering the campaigns we lost

PHOTO: Getty Images

Now playing

02:10

They made it to the White House despite scandals

PHOTO: Getty Images

history of the october surprise foreman ac pkg_00005811.jpg

Now playing

02:14

The history of the October surprise

Now playing

04:02

36 years of election nights on CNN

Now playing

01:15

Watch 10 elections get called on CNN in one minute

PHOTO: CNN

hillary clinton rally daytona beach fbi investigation sot_00002801.jpg

Now playing

00:57

Clinton calls FBI director's actions unprecedented

trump voter id podesta fact check origwx bw_00004624.jpg

Now playing

02:16

Fact check: Trump on undocumented immigrants and voting

hillary clinton rally time lapse origwx bw_00004417.jpg

Now playing

01:21

Hillary Clinton's historic night in time-lapse

PHOTO: John Moore/Getty Images North America/Getty Images

NEW YORK, NY - JULY 23: Anthony Weiner, a leading candidate for New York City mayor, stands with his wife Huma Abedin during a press conference on July 23, 2013 in New York City. Weiner addressed news of new allegations that he engaged in lewd online conversations with a woman after he resigned from Congress for similar previous incidents. (Photo by John Moore/Getty Images)

Now playing

02:01

Clinton's history with Anthony Weiner

PHOTO: CNN

Many North Carolina voters remain undecided in upcoming presidential election_00001405.jpg

Now playing

02:15

Some North Carolina voters hesitant to pick a candidate

PHOTO: CNN

joe biden hillary clinton election intv sot smerconish _00000000.jpg

Now playing

00:46

Biden: I thought I could beat Hillary Clinton

cnnee pkg rodriguez clinton global iniciative hillary emails_00002301.jpg

Now playing

02:47

Hillary Clinton's explanations of her email saga

PHOTO: The Guardian

Now playing

01:17

Gary Johnson snaps at reporter

PHOTO: Mark Makela/Getty Images North America

Democratic Presidential candidate Hillary Clinton and US Vice President Joe Biden acknowledge the crowd at Riverfront Sports athletic facility on August 15, 2016 in Scranton, Pennsylvania.

Now playing

01:26

Biden on Clinton's Secretary of State list?

(CNN) —

Donald Trump says the United States got hosed in the deal it and other world powers struck to halt Iran’s nuclear program because “the Persians are always great negotiators.”

“They are laughing at us back in Iran,” he said in an interview with CNN’s Dana Bash.

He said the agreement is reminiscent of one the United States struck to secure the release of Army Sgt. Bowe Bergdahl, trading five Taliban officials.

“They get their five guys that they most wanted, anywhere in the world. Who makes deals like that?” Trump said.

He blasted President Barack Obama’s administration for failing to secure the release of four U.S. citizens who are imprisoned in Iran on espionage charges.

“Why couldn’t they make that part of the deal? It would have happened quickly – easily if you had the right messenger,” Trump said. “And that should have actually happened earlier. That should have happened at the beginning of the negotiation.”

He also said the United States shouldn’t let up on its economic sanctions against Tehran. If he was in the Oval Office, Trump said, he would have “doubled and tripled up the sanctions, and I would have made a much bigger deal.”

In the interview, Trump also took shots at Hillary Clinton, the Democratic presidential frontrunner who he said has “problems” – in the name of Sen. Bernie Sanders, who he compared to Obama in the 2008 primary.

He said he’s decided to ramp up his attacks on Clinton after her blistering comments in an interview with CNN about his controversial remarks about undocumented immigrants from Mexico.

“We’re too worried about tone in this country and that’s why we’re getting beaten by everybody. It’s about results. You have to get results,” Trump said.

Asked by Bash about a Monmouth University poll released Monday that showed nearly 40% of Republican voters think he’s running just for publicity, Trump also said more Republicans will decide to vote for him once they realize he’s dead serious about becoming the next president.