Trump blasts Graham: He 'should respect me'

Donald Trump, Lindsey Graham
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Donald TrumpDonald TrumpTrump: 'I'm considering' going after Clintons' marriage Ivanka Trump stars in first campaign ad for her father Clinton camp on Trump cameo in Playboy film: 'a strange turn of events' MORE early Monday unloaded on Sen. Lindsey GrahamLindsey GrahamKerry: US 'on the verge' of suspending talks with Russia on Syria GOP leaders express reservations a day after 9/11 veto override McConnell opens door to changing 9/11 bill MORE (R-S.C.), saying his former rival for the GOP presidential nomination should respect him.

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Graham, who suspended his own presidential campaign last December, has been a top critic of Trump throughout the 2016 race.

Graham in recent interviews has urged voters to rally around Ted CruzTed CruzJudge rejects attempt to stop internet oversight transfer Tech groups file court brief opposing internet transition suit Cruz criticizes federal law enforcement on terrorism MORE in the 2016 race, telling NBC's "Meet the Press" on Sunday that Cruz as "made the best case" that he can beat Trump.

Trump on Monday also linked Graham to 2012 Republican presidential nominee Mitt Romney, who last week blasted Trump as a "phony." Trump said both Romney and Graham are "failed" candidates with no credibility.