Republican presidential candidate Donald TrumpDonald John TrumpDems win from coast to coast Falwell after Gillespie loss: 'DC should annex' Northern Virginia Dems see gains in Virginia's House of Delegates MORE on Tuesday accused rival Ted CruzRafael (Ted) Edward CruzOvernight Finance: GOP criticism of tax bill grows, but few no votes | Highlights from day two of markup | House votes to overturn joint-employer rule | Senate panel approves North Korean banking sanctions GOP criticism of tax bill grows, but few ready to vote against it Anti-gay marriage county clerk Kim Davis to seek reelection in Kentucky 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 Cybersecurity: What we learned from Carter Page's House Intel testimony | House to mark up foreign intel reform law | FBI can't access Texas shooter's phone | Sessions to testify at hearing amid Russia scrutiny Cornyn: Senate GOP tax plan to be released Thursday This week: GOP seeks to advance tax overhaul 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.