Trump's recent attack on U.S. District Judge Gonzalo Curiel because of his Mexican-American background prompted Sen. Lindsey Graham to round up the Republicans who have previously endorsed Donald Trump, and persuade them to take it all back.

 Graham claimed that Trump's racist remarks were "the most un-American thing from a politician since Joe McCarthy."

"If anybody was looking for an off-ramp, this is probably it," Graham told The New York Times."

Senator Graham elaborated on this during an interview with NBC News' Hallie Jackson.

"There are a lot of people who want to be loyal to the Republican Party, including me," he said. "But there'll come a point in time where we're gonna have to understand that it's not just about the 2016 race, it's about the future of the party and I would like to support our nominee. I just can't."