Khizr Khan, the father of a fallen Muslim soldier who confronted Donald TrumpDonald John TrumpDemocrats ask if they have reason to worry about UK result Trump scramble to rack up accomplishments gives conservatives heartburn Seven years after Sandy Hook, the politics of guns has changed MORE in a moving speech at the Democratic National Convention earlier this week, pleaded with GOP leaders to call out their party’s presidential candidate.

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Giving an interview alongside his wife Ghazala Khan on MSNBC’s “Last Word,” Khan praised Senate Majority Leader Mitch McConnellAddison (Mitch) Mitchell McConnellSherrod Brown backs new North American trade deal: 'This will be the first trade agreement I've ever voted for' McConnell: Bevin pardons 'completely inappropriate' House panel to hold hearing, vote on Trump's new NAFTA proposal MORE (R-Ky.) and House Speaker Paul RyanPaul Davis RyanJeffries blasts Trump for attack on Thunberg at impeachment hearing Live coverage: House Judiciary to vote on impeachment after surprise delay House Ethics Committee informs Duncan Hunter he can no longer vote after guilty plea MORE (R-Wis.) as patriots, decent human beings and great leaders.

“But isn’t this time to repudiate Trump?” Khan said. “What he has said, what he has threatened to do. This is moral imperative for both leaders to say to him, ‘Enough. You are about to sink the ship of the patriot Republicans.’”

Khan added that other countries look to the U.S. democracy as an example to learn from and that people around the world are concerned about Trump. 

Khan captivated the audience at the Democratic convention earlier this week when he blasted Trump for his rhetoric towards Muslims, telling the Republican candidate, “You have sacrificed nothing and no one.”

Trump himself appeared unimpressed by Khan's speech in remarks he made to The New York Times.

"I'd like to hear his wife say something," Trump said.

On Friday, Khan warned McConnell and Ryan that if Trump governs in the manner that he has campaigned, the country will be plunged into an unprecedented constitutional crisis.

“There is so much at stake and I appeal to both of these leaders, there comes a time in the history of a nation where a ethical, moral stand has to be taken regardless of the political cost,” he said. “The only reason they’re not repudiating his behavior, his threat to our democracy, our decency, our foundation is just because of political consequences.”