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

Former Secretary of State John KerryJohn Forbes KerryJohn Kerry says political 'cynicism has grown' on all sides Avoiding the snake in the grass: Let's not allow impeachment to divide us Romney earns rants and raves for secret Twitter name MORE described allegations President TrumpDonald John TrumpGraham to introduce resolution condemning House impeachment inquiry Support for impeachment inches up in poll Fox News's Bret Baier calls Trump's attacks on media 'a problem' MORE pressured Ukrainian President Volodymyr Zelensky to investigate former Vice President Joe BidenJoe BidenSupport for impeachment inches up in poll Overnight Defense: Trump's Syria envoy wasn't consulted on withdrawal | McConnell offers resolution urging Trump to rethink Syria | Diplomat says Ukraine aid was tied to political investigations Democrats say they have game changer on impeachment 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 GiulianiOvernight Defense: Trump's Syria envoy wasn't consulted on withdrawal | McConnell offers resolution urging Trump to rethink Syria | Diplomat says Ukraine aid was tied to political investigations Democrats say they have game changer on impeachment READ: Diplomat describes pressure put on Ukraine to open 'investigations' 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 PelosiGraham to introduce resolution condemning House impeachment inquiry Democrats say they have game changer on impeachment Hillicon Valley: Zuckerberg would support delaying Libra | More attorneys general join Facebook probe | Defense chief recuses from 'war cloud' contract | Senate GOP blocks two election security bills | FTC brings case against 'stalking' app developer 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) Swan MuellerFox News legal analyst says Trump call with Ukraine leader could be 'more serious' than what Mueller 'dragged up' Lewandowski says Mueller report was 'very clear' in proving 'there was no obstruction,' despite having 'never' read it Fox's Cavuto roasts Trump over criticism of network 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.”