Kerry on Trump, Ukraine: 'If it wasn't already a constitutional crisis, it is now'

Former Secretary of State John KerryJohn Forbes KerryThe Memo: Biden faces balancing act Budowsky: Trump October surprise could devastate GOP Hillicon Valley: Democrats request counterintelligence briefing | New pressure for election funding | Republicans urge retaliation against Chinese hackers MORE described allegations President TrumpDonald John TrumpDeWine tests negative for coronavirus a second time Several GOP lawmakers express concern over Trump executive orders Beirut aftermath poses test for US aid to frustrating ally MORE pressured Ukrainian President Volodymyr Zelensky to investigate former Vice President Joe BidenJoe BidenBiden says Trump executive order is 'a reckless war on Social Security' Trump got into testy exchange with top GOP donor Adelson: report Blumenthal calls for declassification of materials detailing Russian threat to US elections 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 GiulianiRudy GiulianiCoronavirus concerns emerge around debates Giuliani says Black Lives Matter is 'domestic terrorist' group Commission on Presidential Debates rejects Trump campaign call for earlier debate 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 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 PelosiNancy PelosiPelosi, Schumer slam Trump executive orders, call for GOP to come back to negotiating table Trump signs executive orders after coronavirus relief talks falter Sunday shows preview: White House, congressional Democrats unable to breach stalemate over coronavirus relief 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 MuellerRobert (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.”