Khizr Khan, the father of a fallen Muslim soldier who confronted Donald TrumpDonald TrumpFormer Sen. Heller to run for Nevada governor Overnight Defense & National Security — Milley becomes lightning rod Joint Chiefs Chairman Milley becomes lightning rod on right 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 McConnellCEOs urge Congress to raise debt limit or risk 'avoidable crisis' Capito grills EPA nominee on '#ResistCapitalism' tweet Hassan launches first ad of reelection bid focusing on veterans' issues MORE (R-Ky.) and House Speaker Paul RyanPaul Davis RyanPaul Ryan says it's 'really clear' Biden won election: 'It was not rigged. It was not stolen' Democrats fret over Trump-district retirements ahead of midterms To cut poverty and solve the labor shortage, enhance the Earned Income Tax Credit 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.”