Trump blasts Graham: He 'should respect me'
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Donald TrumpDonald John TrumpIvanka Trump pens op-ed on kindergartners learning tech Bharara, Yates tamp down expectations Mueller will bring criminal charges Overnight Cybersecurity: Equifax security employee left after breach | Lawmakers float bill to reform warrantless surveillance | Intel leaders keeping collusion probe open MORE early Monday unloaded on Sen. Lindsey GrahamLindsey Olin GrahamDurbin: I had 'nothing to do' with Curbelo snub Republicans jockey for position on immigration Overnight Health Care: House passes 20-week abortion ban | GOP gives ground over ObamaCare fix | Price exit sets off speculation over replacement 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 CruzRafael (Ted) Edward CruzWhatever you think the Alabama special election means, you’re probably wrong This week: Congress gets ball rolling on tax reform Week ahead: Senators work toward deal to fix ObamaCare markets 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.