Sen. John BarrassoJohn Anthony BarrassoFormer Wyoming Sen. Mike Enzi dies after bicycle accident Overnight Energy: Senate panel advances controversial public lands nominee | Nevada Democrat introduces bill requiring feds to develop fire management plan | NJ requiring public water systems to replace lead pipes in 10 years Senate panel advances controversial public lands nominee in tie vote MORE (R-Wyo.) said Sunday that he expects presumptive GOP presidential nominee Donald TrumpDonald TrumpMyPillow CEO to pull ads from Fox News Haaland, Native American leaders press for Indigenous land protections Simone Biles, Vince Lombardi and the courage to walk away 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 ClintonClintons, Stacey Abrams meeting Texas Democrats Biden says Russia spreading misinformation ahead of 2022 elections Highest-ranking GOP assemblyman in WI against another audit of 2020 vote MORE," he said, "like the last eight years under Barack ObamaBarack Hussein ObamaMillennial momentum means trouble for the GOP Biden's Cuba problem: Obama made a bet and lost Democrats need a coherent response to attacks on critical race theory 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.