At least 226 members of the House of Representatives have publicly backed the impeachment inquiry into President Donald Trump, based on his efforts to pressure Ukraine to investigate former Vice President Joe Biden, a 2020 Democratic presidential candidate, his refusal to comply with congressional subpoenas and his alleged obstruction of justice.

Speaker of the House Nancy Pelosi (D-Calif.) announced a full-blown impeachment inquiry into Trump over his effort to pressure Ukraine on Sept. 24. House Judiciary Committee Chairman Jerrold Nadler (D-N.Y.) has also declared that his committee is engaged in “formal impeachment proceedings” over Trump’s obstruction of justice and invoked Congress’ impeachment power in court filings. No vote has been taken to open a formal impeachment inquiry as was done previously in the cases of Richard Nixon and Bill Clinton.

The impeachment inquiry initially faced resistance from some Democratic Party leaders, who control the 435-member chamber. Earlier, Pelosi cautioned that opening the inquiry would prove “divisive” and is something Trump desires as a potential political benefit to him. But, as support grew among her caucus following revelations about Trump’s conduct toward Ukraine, she announced that she backed an impeachment inquiry into the president.

Support for opening an impeachment inquiry surged following revelations about the president’s efforts to pressure Ukraine to open an investigation into Biden while withholding military aid from the country. Prior to that, it had grown steadily throughout the year as the president’s intransigence toward Congress intensified. The failure of former White House counsel Don McGahn to comply with a subpoena for his testimony resulted in one of the first big bursts of support for impeachment.

The House majority of lawmakers backing the inquiry consist of 225 Democrats ― over 90% of the party’s caucus ― and one then-Republican, Rep. Justin Amash of Michigan, who has since become an independent. The group includes 23 Democrats on the House Judiciary Committee ― all but one of the party members on the panel. All of the Democrats on the committee, however, voted to open an impeachment investigation into the president.

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The six House committee chairs conducting the formal impeachment inquiry into Trump called his actions toward Ukraine “a shakedown” on Sept. 25.

“Congress is now exercising its constitutional responsibility to investigate under the umbrella of impeachment, and we need cooperation immediately,” the chairs said in a letter.

Calls for an impeachment inquiry began earlier with the release of special counsel Robert Mueller’s report on Russian interference in the 2016 elections. Mueller said on May 29 that if his investigation into Trump found that the president did not commit the crime of obstruction of justice, the report would have said so. The report contained no such exoneration. He also noted that Justice Department regulations precluded his office from indicting a sitting president and implied that the only way to accuse a president of wrongdoing was through Congress’ impeachment authority.

“The Constitution requires a process other than the criminal justice system to formally accuse a sitting president of wrongdoing,” Mueller said.