Republican presidential candidate Donald TrumpDonald John TrumpBiden slams Trump over golf gif hitting Clinton Trump Jr. declines further Secret Service protection: report Report: Mueller warned Manafort to expect an indictment MORE on Tuesday accused rival Ted CruzRafael (Ted) Edward CruzSenate Dems hold floor talk-a-thon against latest ObamaCare repeal bill Overnight Finance: CBO to release limited analysis of ObamaCare repeal bill | DOJ investigates Equifax stock sales | House weighs tougher rules for banks dealing with North Korea GOP state lawmakers meet to plan possible constitutional convention MORE of having “a mental problem.”

“Seriously, he’s got a mental problem,” Trump told host Maria Bartiromo on Fox Business Network’s "Mornings with Maria."

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“There’s never been any politician — or almost anybody in my life — that I’ve seen that lies so much.”

Trump said Cruz is misleading Americans about Trump's fundamental policy positions on hot-button topics including gun control and healthcare.

“He will say I’m against the Second Amendment,” he said. “He will say I’m terribly in favor of ObamaCare, which is ridiculous. These are things that are staples of what I'm about.

"I’m totally in favor of the Second Amendment. ... I want the Second Amendment — I’d strengthen it if anything."

Trump added that other GOP White House hopefuls have slammed Cruz for dishonesty.

“By the way, I’m not the only that said it,” he said. "Marco RubioMarco Antonio RubioOvernight Defense: Senate passes 0B defense bill | 3,000 US troops heading to Afghanistan | Two more Navy officials fired over ship collisions Senate passes 0B defense bill Trump bets base will stick with him on immigration MORE called him a liar during the debate.”

Cruz has repeatedly accused Trump and Rubio of not being sufficiently conservative. He accused both men on Monday of shouting “liar” at critics anytime their actual beliefs are put in the spotlight.

“It is not being honest or candid for either Marco Rubio or Donald Trump to pretend that their records are different than what they are and simply yell and scream at anyone who points to the words that have come out of their own mouths,” Cruz said.