Aug. 12, 2019
An anonymous whistleblower filed a complaint about Trump’s dealings with Ukraine that was forwarded to Congress. The complaint was deemed urgent and credible.
Sept. 24, 2019
House Speaker Nancy Pelosi announced the impeachment inquiry. The House of Representatives has the sole power of impeachment, according to the Constitution, though it is the Senate that has the power to try all impeachments and remove a president from office.
“The actions of the Trump presidency revealed dishonorable fact of the president’s betrayal of his oath of office, betrayal of our national security and betrayal of the integrity of our elections,” Pelosi said in a statement.
Related: The president’s action in Ukraine ‘was wrong,’ experts say
Sept. 25, 2019
The White House released a memorandum of the Trump-Zelenskiy phone call, which the president continues to call “perfect.”
Oct. 3, 2019
Chairmen of House committees released text messages from US-Ukraine envoys that indicated evidence that security assistance was conditioned on Ukrainian investigations into Trump’s political rivals.
Related: US diplomat thought it was ‘crazy’ to withhold Ukraine aid: texts
Oct. 8, 2019
The White House called the impeachment inquiry “constitutionally invalid” and refused to comply with House investigators.
Related: Amid Trump impeachment inquiry, future diplomats consider their own ‘red lines’
Still, nearly a dozen current and former officials have testified, including US ambassador to the European Union, Gordon Sondland, a Trump donor and political appointee. One of the “three amigos” who replaced core policymakers for Ukraine, according to testimony, Sondland was initially stopped from testifying by the State Department on Oct. 8, but spoke to Congressional investigators on Oct. 17.
“He is one of the really key people who have been involved with these efforts, along with Kurt Volker and Rudy Giuliani, of sort of putting into place these actions toward Ukraine that were sort of outside of the normal diplomatic channels,” Margaret Taylor said.
Related: This ex-MP wants to help untangle Giuliani’s business dealings in Ukraine
The same day, acting White House Chief of Staff Mick Mulvaney told reporters on tape that the Trump administration suspended military aid to Ukraine in order to force an investigation into the 2016 election — and that it was perfectly normal to do so. Mulvaney later walked that statement back, accusing reporters of misconstruing his words.
William Taylor, the top US diplomat in Ukraine, spoke to lawmakers behind closed doors on Oct. 22. In his opening statement, William Taylor said that “in August and September of this year, I became increasingly concerned that our relationship with Ukraine was being fundamentally undermined by an irregular, informal channel of US policymaking and by the withholding of vital security assistance for domestic political reasons.”
Other testimony from officials, including Fiona Hill, former national security adviser on Russian and European affairs; Marie Yovanovitch, ousted US ambassador to Ukraine; and Michael McKinley, former senior adviser to Secretary of State Mike Pompeo, have appeared to support the claim that the president’s foreign policy in Ukraine was problematic and detrimental to US diplomacy.
Related: Jeff Flake: Republicans stand by amid Trump’s ‘abuse of power’
Trump allies have cast doubt on the veracity of claims and engaged in ad hominem attacks on several of the officials testifying. But with the House vote Thursday, Americans will have a better look at the investigation going forward.
“Everything that’s been done up until now is sort of perfectly fine and legally legitimate,” said Margaret Taylor. But the vote is important too. “It’s more adding, I think, political legitimacy and heft to this process.”