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 described allegations 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 pressured Ukrainian President Volodymyr Zelensky to investigate 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’s son Hunter Biden as a “constitutional crisis” Wednesday.

“The investigation will flush more rats from the sewers (Rudy!)” Kerry tweeted Wednesday, referencing Trump’s personal attorney Rudy Giuliani Rudy GiulianiThe Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting CIA found Putin 'probably directing' campaign against Biden: report Democrats fear Russia interference could spoil bid to retake Senate MORE, who has said he met with representatives of Zelensky on behalf of the State Department.

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“But don't get lost in the weeds of quid pro quo: the president abused his power to bully an ally into becoming his campaign's opposition research arm. If it wasn't already a constitutional crisis, it is now,” Kerry added.

The investigation will flush more rats from the sewers (Rudy!) - but don't get lost in the weeds of quid pro quo: the president abused his power to bully an ally into becoming his campaign's opposition research arm. If it wasn't already a constitutional crisis, it is now. — John Kerry (@JohnKerry) September 25, 2019

The allegations, the subject of an anonymous whistleblower complaint, have triggered a flood of calls for impeachment from House Democrats who had previously demurred or remained noncommittal on the issue, including several defending competitive swing districts in 2020.

House 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.) officially announced an impeachment inquiry Tuesday afternoon.

Kerry previously said on Monday that he was in “absolute shock” over the allegations, expressing “amazement” on MSNBC’s “Morning Joe” that “apparently, within hours or days of [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's] 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.”