Republican presidential candidate Donald TrumpDonald John TrumpTillerson: Russia already looking to interfere in 2018 midterms Dems pick up deep-red legislative seat in Missouri Speier on Trump's desire for military parade: 'We have a Napoleon in the making' MORE on Tuesday accused rival Ted CruzRafael (Ted) Edward CruzSasse statement: Trump nominee who spread conspiracy theories has a ‘tinfoil hat’ Coalition of 44 groups calls for passage of drug pricing bill For the sake of our democracy, politicians must stop bickering 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 RubioTrump must send Russia powerful message through tougher actions McCain, Coons immigration bill sparks Trump backlash Taking a strong stance to protect election integrity 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.