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 on Monday said he’s in “absolute shock” over reports that President Trump asked Ukrainian leaders for information on former Vice President Joe Biden Joe BidenFormer Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick Bloomberg rolls out M ad buy to boost Biden in Florida MORE, a 2020 White House hopeful.

“My reaction is one of absolute shock and amazement that, apparently, within hours or days of the Mueller testimony, the president is on the telephone putting American foreign policy in hock while he extorts the leader of another country to Russia's advantage,” Kerry said Monday on MSNBC’s “Morning Joe.”

"My reaction is one of absolute shock and amazement that apparently within hours or days of the Mueller testimony, the president is on the telephone putting American foreign policy in hock while he extorts the leader of another country to Russia's advantage..." -- @JohnKerry pic.twitter.com/aKC335vpT3 — Morning Joe (@Morning_Joe) September 23, 2019

A call between Trump and the Ukrainian president has dominated discussion in Washington amid reports that Trump asked for help in getting dirt on Democratic presidential front-runner Joe Biden.

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Trump and administration officials have denied the reporting, but have not released a copy of the whistleblower complaint or a transcript of the call.

The Wall Street Journal reported that during the call Trump asked Ukrainian President Volodymyr Zelensky to look for dirt on Biden.

Trump has not denied that he urged Ukraine to investigate the former vice president.

The president, on Sunday, doubled down on his call for Biden's dealings with Ukraine to be investigated, insisting there was no quid pro quo involved in the talks with the Ukrainian president, calling it a "perfect conversation."

Former special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE has said he found evidence that Trump’s 2016 campaign welcomed foreign assistance from Russia during the election.

The allegations over Trump’s call with Ukraine have raised new calls by some House Democrats for an impeachment inquiry.

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 remained hesitant to call for impeachment but warned of a “new stage of investigation” if the Trump administration blocks the whistleblower.