Graham: GOP is at risk of breaking apart
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Sen. Lindsey GrahamLindsey Olin GrahamSteyer brings his push to impeach Trump to town halls across the nation Trump formally sends Pompeo nomination to Senate GOP leaders to Trump: Leave Mueller alone MORE (R-S.C.) warned on Sunday that Republican presidential front-runner Donald TrumpDonald John TrumpKoch-backed group launches six-figure ad buy against Heitkamp Anti-abortion Dem wins primary fight Lipinski holds slim lead in tough Illinois primary fight MORE is putting the party at risk of breaking apart.

In a radio interview with John Catsimatidis, the former presidential candidate explained his reasoning for backing Texas Sen. Ted CruzRafael (Ted) Edward CruzCruz says Cambridge Analytica assured him its practices were legal Dem battling Cruz in Texas: ‘I can understand how people think this is crazy’ Overnight Tech: Facebook faces crisis over Cambridge Analytica data | Lawmakers demand answers | What to watch for next | Day one of AT&T's merger trial | Self-driving Uber car kills pedestrian MORE, someone he has butted heads with in the past.

“I’m supporting Cruz because I think he is a reliable conservative; I think the election will be much more competitive with Ted Cruz,” he said. “The people of New York voted overwhelmingly for Donald Trump in the Republican primary — I respect that.

“I have never been more worried about the Republican Party breaking apart than I am today.”

Graham said the silver lining of Trump’s rise is that it means people are tired of “big-government liberalism.”

“What we have to do as Republicans is offer an alternative that’s common sense, that people can understand, that’s hopeful and optimistic, not hateful," he said. "I pray the Republican Party can nominate somebody that can beat [Democratic presidential front-runner] Hillary ClintonHillary Diane Rodham ClintonKoch-backed group launches six-figure ad buy against Heitkamp Trump keeps up 'low IQ' attack on Maxine Waters GOP leaders to Trump: Leave Mueller alone MORE, because if she wins we’re going to have a third term of Barack ObamaBarack Hussein ObamaWater has experienced a decade of bipartisan success Kentucky candidate takes heat for tweeting he'd like to use congressman for target practice What’s genius for Obama is scandal when it comes to Trump MORE.”