It's been one month since impeachment proceedings began against President Donald Trump.
House Speaker Nancy Pelosi announced on September 24 that a formal inquiry would look into a conversation Trump had with Ukraine's president in which he asked him to investigate allegations of corruption against Democrat presidential candidate Joe Biden and his son Hunter.
Impeachment is a power Congress has to remove presidents or other federal officials from office if enough lawmakers find that they have committed "treason, bribery, or other high crimes and misdemeanors."
First there's the investigation, then the House of Representatives votes on whether to impeach Trump, and if a majority votes in favor, then Trump could face a Senate hearing to determine the penalty.
Three other presidents have faced impeachment proceedings.
In 1868, Andrew Johnson was impeached for breaching the Tenure of Office Act, but the Senate narrowly acquitted him by one vote. In 1974, Richard Nixon faced an impeachment inquiry, but he quit before he could be impeached. In 1998, Bill Clinton was impeached, but he was acquitted by the Senate.
Only 11 days had passed after a whistleblower complaint before Pelosi announced an impeachment inquiry, Axios reported. For Nixon, it took 599 days from the Watergate break-in to an inquiry, while for Clinton it took 260 days from the first news report of an affair to an inquiry.
Here's how the process went for the three former presidents, and what's happened so far for Trump.