In an interview with CNN's Christiane Amanpour on Friday, former Secretary of State John Kerry John Forbes KerryThe Memo: Warning signs flash for Trump on debates Divided country, divided church TV ads favored Biden 2-1 in past month MORE commented on what he believes is serious evidence that has mounted against President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE in the House impeachment inquiry. He went on to compare the situation to former President Nixon's impeachment.

"The evidence is powerful, some of it more powerful already than what we saw in the impeachment of Richard Nixon," Kerry said in the CNN interview. "The evidence at this point in time certainly merits the inquiry that is taking place."

The former secretary did not go as far as to say Trump should be impeached, stating "the evidence has to be examined," and that he did not want to draw conclusions.

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Kerry also called for allowing investigators to "do their work appropriately" days after a group of Republican lawmakers entered a secure room known as a sensitive compartmented information facility.

"It would be far better for democracy and the whole world if the world could see a Congress in which everybody was respecting the legitimacy of this process and let the facts tell the story," he said.

Speaker Nancy Pelosi Nancy PelosiDemocratic senator to party: 'A little message discipline wouldn't kill us' Overnight Health Care: New wave of COVID-19 cases builds in US | Florida to lift all coronavirus restrictions on restaurants, bars | Trump stirs questions with 0 drug coupon plan Overnight Defense: Appeals court revives House lawsuit against military funding for border wall | Dems push for limits on transferring military gear to police | Lawmakers ask for IG probe into Pentagon's use of COVID-19 funds MORE (D-Calif.) has launched an impeachment inquiry into Trump over his dealings with Ukraine. House members on several investigative committees have been hearing testimony from a series of current and former officials.

Trump has denied wrongdoing on numerous occasions, calling his July 25 call with Ukrainian President Volodymyr Zelensky "perfect."

Nixon resigned from office over the infamous Watergate scandal. Many believe he would have been impeached if he did not resign.