(CNN) Calling him a "fair weather originalist" and accusing him of "constitutional hypocrisy," Ted Cruz's former law school professor is arguing that the Texas senator's own legal philosophy disqualifies him from serving as president.

Laurence Tribe, a constitutional law professor at Harvard whose students include President Barack Obama and Supreme Court justices John Roberts and Elena Kagan, hammered Cruz over questions about his presidential eligibility because of his birth in Canada, which have been raised by Donald Trump and caused headaches for the Calgary-born Texas senator in the Republican primary.

Appearing on "Anderson Cooper 360" Monday night, Tribe slammed Cruz for his "constitutional hypocrisy."

He argued that the strict, originalist legal philosophy that Cruz advocates on issues like the 2nd Amendment and gay marriage, and which his potential Supreme Court nominees would likely espouse, should disqualify him from being president.

"Ironically, the kind of justices he says he wants are the ones that say he's not eligible to run for president," Tribe argued. "This is important because the way this guy plays fast and loose with the Constitution, he's a fair weather originalist."

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