President Trump thinks he is above the law, Harvard professor Laurence Tribe said Sunday.

"He has shown no respect for the rule of law, regards himself as above the law," Tribe said on ABC's "This Week."

"He thinks it's appropriate to essentially have a job interview with the FBI director as we now know."

Tribe then pointed to a report that Trump had asked former FBI Director James Comey to pledge his loyalty during a dinner earlier this year.

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Comey reportedly refused Trump's request, which reportedly irked the president. The then-FBI chief pledged "honesty," according to a report in The New York Times.

"Kings and monarchs and dictators seek that kind of loyalty," Tribe said on Sunday.

"He essentially said if you assure me that this...Russia investigation will go away, maybe I'll keep you on. That's obstruction of justice."

Tribe said impeachment is the last resort for someone who treats him or herself as above the law.

"The most relevant thing is whether this president, by his recent course of action, on top of his violations of the foreign corruption or emoluments clause, this president has shown that he cannot be trusted to remain within the law," Tribe said.

"Our Constitution's last resort for situations of that kind is to get the person out of office."

Trump sparked controversy last week when he fired Comey. Some have since raised concerns over the White House's varying accounts of why the former FBI director was fired.