The impeachment of a sitting American president is among the gravest constitutional acts the legislative branch can undertake, and by the time the House of Representatives voted on December 18, 2019, the proceedings that had consumed Washington for months had transformed American politics in ways that would reverberate for years. Donald Trump became the third president in United States history to be impeached by the House of Representatives, following Andrew Johnson in 1868 and Bill Clinton in 1998.
The events that triggered the impeachment inquiry began with a whistleblower complaint filed in August 2019. The complaint alleged that Trump had used the power of his office to solicit foreign interference in the 2020 presidential election for personal political benefit. Specifically, the complaint concerned a July 25, 2019 phone call between Trump and Ukrainian President Volodymyr Zelenskyy, during which Trump allegedly conditioned military aid and a White House invitation on Ukraine announcing investigations into Joe Biden, who was then the leading candidate for the Democratic presidential nomination, and into a debunked conspiracy theory claiming that Ukraine rather than Russia had interfered in the 2016 American presidential election.
The formal impeachment inquiry launched in September 2019 produced a detailed factual record through depositions and public hearings. Witnesses including senior administration officials and diplomats testified that Trump had directed a shadow foreign policy toward Ukraine through personal attorney Rudy Giuliani, and that military assistance approved by Congress had been withheld as leverage. The inquiry found that Trump had obstructed the investigation by instructing administration officials to refuse subpoenas for both documents and testimony, asserting sweeping claims of executive privilege that became the subject of multiple lawsuits.
A series of public impeachment hearings before the House Judiciary Committee began on December 4, 2019. Nine days later, on December 13, the committee voted 23 to 17, entirely along party lines, to recommend two articles of impeachment: abuse of power and obstruction of Congress. Two days after that, the full House approved both articles in a vote that also fell largely along party lines. Trump was now the first American president to be impeached without any support for the impeachment from members of his own party, a distinction that underscored the depth of partisan polarization surrounding the proceedings.
The impeachment articles were formally submitted to the Senate on January 16, initiating a trial that concluded in early February 2020. The Senate trial was notable for what it lacked as much as what it contained. Republican senators voted as a bloc to reject efforts by Democrats to subpoena witnesses or additional documents, making the Trump impeachment trial the first in American history in which no witness testimony was permitted. On February 5, 2020, the Senate voted to acquit Trump on both articles of impeachment, with neither count approaching the two-thirds supermajority required for conviction and removal. Mitt Romney of Utah became the sole Republican senator to vote to convict on the first article, the abuse of power charge, making him the only senator in American history to vote to convict a president of his own party.
Trump remained in office and completed his first term. The acquittal was widely interpreted not as an exoneration of the underlying conduct but as a reflection of the political arithmetic of a Senate controlled by Republicans unwilling to break with a president who commanded intense loyalty from the Republican base. Democratic leadership had initially been reluctant to pursue impeachment, with Speaker of the House Nancy Pelosi resisting calls from members of her caucus throughout 2017 and 2018. It was only after repeated actions she characterized as obstruction of justice and defiance of congressional subpoenas, combined with the Ukraine matter in 2019, that she committed to the formal inquiry.
The first impeachment also took place against the backdrop of earlier attempts by Democratic representatives to impeach Trump, including a resolution in December 2017 that failed in the House by a margin of 58 to 364. The 2018 midterm elections, which returned Democratic control of the House, opened the door for the multiple congressional investigations that eventually produced the impeachment inquiry.
In January 2021, following the January 6 attack on the United States Capitol, Trump was impeached for a second time, becoming the first president in American history to be impeached twice. He was again acquitted by the Senate in February 2021 after having left office. The two impeachments together represent a singular chapter in American constitutional history, one that tested the mechanisms designed by the framers to hold executive power accountable while also revealing the ways in which partisan polarization could circumscribe those mechanisms in practice.
