Republican presidential front-runner Donald Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE is brushing off news that Sen. Lindsey Graham Lindsey Olin GrahamSenate Republicans face tough decision on replacing Ginsburg Democratic senator calls for eliminating filibuster, expanding Supreme Court if GOP fills vacancy What Senate Republicans have said about election-year Supreme Court vacancies MORE (R-S.C.) is apparently backing his main rival for the nomination, Sen. Ted Cruz Rafael (Ted) Edward CruzSenate Republicans face tough decision on replacing Ginsburg Cruz: Trump should nominate a Supreme Court justice next week Renewed focus on Trump's Supreme Court list after Ginsburg's death MORE (R-Texas).

Trump suggested Friday that Cruz was on the receiving end of a "jinx" after Graham, who endorsed Jeb Bush after ending his own campaign, signaled support for Cruz.

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"Lyin' Ted Cruz lost all five races on Tuesday-and he was just given the jinx - a Lindsey Graham endorsement. Also backed Jeb. Lindsey got 0!" Trump tweeted.

The businessman's remarks come a day after news emerged that Graham, a vocal opponent of Trump, would be hosting a fundraiser next week for Cruz.

Graham has long been critical of Cruz, and as recently as last month joked about the Texan being murdered on the Senate floor. But the South Carolina Republican has been outspoken about his desire to see Trump defeated. Trump cited Graham's past insults of Cruz in a tweet later Friday. "No wonder nobody trusts politicians!" he said. Senator @LindseyGrahamSC made horrible statements about @SenTedCruz – and then he endorsed him. No wonder nobody trusts politicians! — Donald J. Trump (@realDonaldTrump) March 18, 2016 “I think Ted Cruz is a reliable Republican, strong on Israel, would repeal and replace ObamaCare, would be good on the Supreme Court,” Graham told reporters Thursday. “I think Ted Cruz is a reliable Republican, strong on Israel, would repeal and replace ObamaCare, would be good on the Supreme Court,” Graham told reporters Thursday.

“So we have many things in common, but we also have many differences.”