Sen. John BarrassoJohn Anthony BarrassoLatest Trump proposal on endangered species could limit future habitat, critics say Republicans dismiss Trump proposal to delay election Barrasso nuclear bill latest GOP effort to boost uranium mining MORE (R-Wyo.) said Sunday that he expects presumptive GOP presidential nominee Donald TrumpDonald John TrumpJoe Arpaio loses bid for his old position as sheriff Trump brushes off view that Russia denigrating Biden: 'Nobody's been tougher on Russia than I have' Trump tees up executive orders on economy but won't sign yet MORE to support the Republican Party's platform.

"The platform committee will meet in Cleveland in July for a full week before the convention. It's 112 members of the platform committee, and we've asked Donald Trump to allow the process to play out. He's agreed to do that," Barrasso, the chairman of the GOP's platform committee at the Republican National Convention, said on ABC's "This Week." 

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"And I've asked him personally to embrace the platform, and I believe he will. National security will be a big part of it."

Barrasso said the platform is about the "core values" of the Republican Party.

"It's who we are. It's what we stand for, and I met with Donald Trump about it and he understands that the platform is very important to the Republican Party," he said. 

"The platform is going to be one that all Republicans can be proud of," Barrasso said. 

Barrasso also said the Republican Party is much more united than the Democratic Party.

"We're going to have to work our way through the maze of the platform discussions, but the Democrats, they're looking at having to work their way through a minefield, which could be explosive," he said.

He said he expects the Republican Party to come out of the convention united, adding it is "critical" to win in November.

"We cannot afford, as a country, another four years under [Democratic presidential front-runner] Hillary ClintonHillary Diane Rodham ClintonDemocratic convention lineup to include Ocasio-Cortez, Clinton, Warren: reports Trump brushes off view that Russia denigrating Biden: 'Nobody's been tougher on Russia than I have' Kanye West 'not denying' his campaign seeks to damage Biden MORE," he said, "like the last eight years under Barack ObamaBarack Hussein ObamaBiden's immigration plan has serious problems Hearing for Twitter hack suspect Zoom-bombed by porn, rap music Read: Sally Yates testimony MORE."

Barrasso also shied away from condemning Trump’s proposed Muslim ban, instead saying a big part of the party’s platform will focus on national security.

“Well, Trump has won. What - where does the party now stand on that Muslim ban?” asked host Jonathan Karl.

“It’s going to be a conservative platform that’s going to be positive, optimistic, looking to the future, focused on things like jobs, the economy, and national security. And what he was focused on with that ban is national security,” he said.

--This report was updated at 12:55 p.m.