Donald Trump on Wednesday became the third U.S. president to be impeached as the House of Representatives formally charged him with abuse of power and obstruction of Congress in a historic step that will inflame partisan tensions across a deeply divided America.

The Democratic-led House's passage of two articles of impeachment on a mostly party-line vote sets the stage for a trial next month in the Republican-controlled Senate - friendlier terrain for Trump - on whether to convict and remove him from office.

No president in the 243-year history of the United States has been removed from office by impeachment. That would require a two-thirds majority in the 100-member Senate, meaning at least 20 Republicans would have to join Democrats in voting against Trump - and none have indicated they will.