WASHINGTON (AP) — President Donald Trump was impeached by the U.S. House of Representatives Wednesday night, becoming only the third American chief executive to be formally charged under the Constitution’s ultimate remedy for high crimes and misdemeanors.

The historic vote split along party lines, much the way it has divided the nation, over the charges that the 45th president abused the power of his office by enlisting a foreign government to investigate a political rival ahead of the 2020 election. The House also voted in favor, again along party lines, on a charge that he then obstructed Congress in its investigation.

The articles of impeachment, the political equivalent of an indictment, now go to the Senate for trial. If Trump is acquitted by the Republican-led chamber, as expected, he would have to run for reelection carrying the enduring mark of impeachment on his purposely disruptive presidency.

Democrats led Wednesday night’s voting, framed in what many said was their duty to protect the Constitution and uphold the nation’s system of checks and balances. Republicans stood by their party’s leader, who has frequently tested the bounds of civic norms. Trump called the whole affair a “witch hunt,” a “hoax” and a “sham,” and sometimes all three.

The trial is expected to begin in January in the Senate, where a vote of two-thirds is necessary for conviction. While Democrats had the majority in the House to impeach Trump, Republicans control the Senate and few if any are expected to diverge from plans to acquit the president ahead of early state election-year primary voting.

Pelosi, once reluctant to lead Democrats into a partisan impeachment, now risks her majority and speakership to hold the president accountable.

“Today we are here to defend democracy for the people,” Pelosi said opening debate.

Trump, who began Wednesday tweeting his anger at the proceedings, scheduled an evening rally in Battle Creek, Michigan.

As the House debated the articles of impeachment throughout the day, Trump registered his anger with the process on Twitter, in all capital letters: “SUCH ATROCIOUS LIES BY THE RADICAL LEFT, DO NOTHING DEMOCRATS. THIS IS AN ASSAULT ON AMERICA, AND AN ASSAULT ON THE REPUBLICAN PARTY!!!!” he wrote.

What Pelosi called a sad and solemn moment for the country, coming in the first year that Democrats swept control of the House, unfolded in a caustic daylong session that showcased the nation’s divisions — not only along party lines, but also by region, race and culture.