Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. Nine Things to Know About Trump Impeachment Controversy Masood Farivar WASHINGTON - House Speaker Nancy Pelosi on Tuesday announced a "formal impeachment inquiry" into President Donald Trump, escalating a long-running clash between Democratic lawmakers and the White House over alleged presidential malfeasance.The announcement followed disclosures that Trump in a July 25 call to Ukraine's president asked him to investigate front-running Democratic candidate Joe Biden and his son, Hunter. Here are nine things you need to know about the festering impeachment controversy. What is impeachment? This refers to the constitutional process of removing a sitting president from office.The U.S. Constitution gives Congress the power to oust a president for "treason, bribery or other high crimes and misdemeanors." While there is no single definition of the phrase "high crimes and misdemeanors," it is generally understood to include actions that violate the oath of office and the public trust. The impeachment process begins with formal charges brought in the House of Representatives and ends with a trial in the Senate where two-thirds of senators must vote to convict the president. This would be the fourth congressional impeachment attempt in history. Former presidents Andrew Johnson and Bill Clinton were impeached and brought to trial in the Senate, but subsequently won acquittal. Former President Richard M. Nixon resigned before being impeached in the House. What happened on Tuesday? To be clear, what Pelosi did is at least several steps from formal action against Trump. By ordering a formal impeachment inquiry, Pelosi brought a half dozen House investigations of Trump under a new rubric. She instructed the chairmen of six House committees -- Intelligence, Judiciary, Government Oversight, Foreign Affairs, Ways and Means and Financial Services -- to speed up their investigations to determine whether to impeach Trump. .