President Donald Trump has been impeached, becoming only the third commander-in-chief to face such an undertaking in the 243-year history of the United States.The announcement came after a debate on Wednesday in the US House of Representatives which discussed two charges – that he abused his power and obstructed the US Congress.In tweets posted late on Tuesday night, Trump said he was not worried and accused “crazy” Democrats of “breaking the law in so many ways”.....They want to Impeach me (I’m not worried!), and yet they were all breaking the law in so many ways. How can they do that and yet impeach a very successful (Economy Plus) President of the United States , who has done nothing wrong? These people are Crazy!— Donald J. Trump (@realDonaldTrump) December 18, 2019Earlier the president had set out his objections in an extraordinary and rambling six-page letter.The bizarre document smeared the impeachment process as “unconstitutional”, accusing Democrats of “perversion of justice and abuse of power” in their effort to remove him from office.He also acknowledged he was powerless to stop the expected outcome.Ahead of House votes, one by one, centrist Democratic members of congress – including many first-term freshmen who built the House majority and could risk their reelection in districts where the president is popular – announced they would vote to impeach.Republicans disagreed, firmly.Senate majority leader Mitch McConnell set the partisan tone for the next step, as attention will shift to the senate which, under the US constitution, is required to hold a trial on the charges, PA Media reports.That trial is expected to begin in January.“I’m not an impartial juror,” McConnell declared.The Republican-majority upper chamber is practically certain to acquit the president.This is a breaking news story and will be updated. Follow HuffPost UK on Twitter here, and on Facebook here.Related... Donald Trump Impeachment: 7 Highlights From His Bonkers Letter Blasting Democrats Protesters Across US Demand Trump's Removal Ahead Of Impeachment Vote