**Key Documents**.
* [Whistleblower complaint](https://www.intelligence.senate.gov/sites/default/files/documents/20191009_inspector_general_report_whistleblower_complaint.pdf).
* [Rough transcript of Trump-Zelensky call](https://www.whitehouse.gov/briefings-statements/memorandum-telephone-conversation-between-president-trump-and-president-zelenskyy-july-25-2019/).
* [House Intelligence Committee report](https://intelligence.house.gov/uploadedfiles/20191213-ihc-impeachment_report.pdf).
* [Senate Intelligence Committee report](https://www.intelligence.senate.gov/publications/republican-staff-report-findings-investigation-presidents-ukraine-affairs).
**Timeline of Events**.
* **July 25, 2019:** Trump speaks with Ukrainian President Volodymyr Zelensky and allegedly pressures him to investigate his political rival, Joe Biden..
* **August 12, 2019:** A whistleblower files a complaint with the Intelligence Community Inspector General (ICIG) alleging that Trump abused his power of office..
* **September 24, 2019:** ICIG publishes the whistleblower complaint, sparking a formal impeachment inquiry by the House of Representatives..
* **October 31, 2019:** The House Intelligence Committee votes to approve two articles of impeachment against Trump: abuse of power and obstruction of Congress..
* **December 18, 2019:** The House votes to impeach Trump on both articles of impeachment..
* **January 16, 2020:** The Senate trial begins..
* **February 5, 2020:** The Senate votes to acquit Trump on both articles of impeachment..
**Key Questions**.
* Did Trump abuse his power of office by pressuring Ukraine to investigate Biden?.
* Did Trump obstruct Congress by refusing to cooperate with the impeachment inquiry?.
* What is the role of Congress in holding the president accountable for alleged wrongdoing?.
**Significance of the Impeachment Inquiry**.
The impeachment inquiry and subsequent trial of Donald Trump were a significant event in American history. It was only the third time in US history that a president had been impeached, and the first time that a president had been acquitted by the Senate. The inquiry raised important questions about the president’s power, the role of Congress, and the nature of impeachment itself..
The legacy of the impeachment inquiry is still being debated. Some argue that it was a necessary step to hold the president accountable for his alleged misconduct, while others argue that it was a politically motivated attempt to remove Trump from office. The inquiry will likely continue to be a subject of debate for years to come..
