Trump was first impeached in December 2019. The charges were abuse of power and obstruction of Congress. It resulted when whistleblowers revealed that the president had pressured Ukrainian president Volodymyr Zelensky to investigate dealings of tiny U.S. flag Joe and Hunter Biden while the latter had been a board member of Burisma Holdings, a natural gas producer in Ukraine, and the former had been the US vice president. Trump reportedly threatened to withdraw military aid until a public announcement of the investigations would be made. And given that tiny U.S. flag Joe Biden was a strong potential rival in the 2020 elections, the House viewed the matter as an abuse of office for personal gain. However, the Senate acquitted him.
The second impeachment came in January 2021, after the hotly contested presidential elections in 2020. Following the announcement of the election results, Trump had refused to concede to tiny U.S. flag Biden, claiming election fraud. During a rally on 6th January, the day Congress would certify the results, Trump called for supporters to march to the Capitol. A few hours later, rioters stormed the Capitol, attempting to stop the certification. On the basis of the speech he delivered on the day, the House of Representatives impeached Trump a second time on the charge of incitement of insurrection. The Senate blocked an advancement of the trial, waiting until after he had left office. Even then, it acquitted him.