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WATCH: House prosecutors read Trump impeachment charges to Senate

WASHINGTON (AP) — Congress opened the impeachment trial of President Donald Trump on Thursday, with House Democrats reading the formal charges from the well of the U.S. Senate ahead of the swearing in of all 100 senators as jurors for only the third impeachment trial in U.S. history.

“Hear ye, hear ye, hear ye!” said the Senate’s sergeant at arms, calling the proceedings to order.

Seven lawmakers prosecuting the charges, led by Rep. Adam Schiff of the Intelligence Committee and Rep. Jerrold Nadler of the Judiciary Committee, made the solemn walk across the Capitol for a second day. It’s the start of ceremonial protocol that shifts the proceedings out of Speaker Nancy Pelosi’s Democratic-run House to the Republican-majority Senate.

Schiff, standing in the well of the Senate usually reserved for senators, began reading the resolution, “Impeaching Donald John Trump, president of the united states for high crimes and misdemeanors.”

Later in the afternoon, Chief Justice John Roberts was to administer the jurors’ oath to senators who swear to deliver “impartial justice.”

The events, unfolding during an election year as Trump seeks another term, will be a test not only of his presidency but also of the nation’s three branches of power and its system of checks and balances. Several senators are running for the Democratic party’s nomination to challenge Trump in November.

The president calls the impeachment a “hoax,” even as new information emerges about his actions toward Ukraine that led to the charges against him.