On December 18, 2019, by a majority vote, the House of Representatives impeached President Trump for abusing power by soliciting Ukrainian interference in the 2020 presidential election and then obstructing the House's impeachment investigation. The allegations against Trump rested substantially on a phone conversation between Trump and Ukrainian president Volodymyr Zelensky on July 25, 2019. During this conversation, Trump asked Zelensky to investigate the prior conduct of Joe Biden—Trump's likely political opponent for the 2020 presidential election. While the House was conducting its impeachment investigation, the White House directed executive branch officials not to testify or to turn over documents. Less than two months after the impeachment, on February 5, 2020, the Senate voted to acquit Trump of the charges, with a majority of Senators voting in favor of acquittal.