By Agence France-Presse As lawmakers trickled into the US House of Representatives Wednesday to debate the impeachment of Donald Trump, the congresswoman who gaveled in the session felt the full weight of history upon her shoulders. US Speaker of the House Nancy Pelosi brought the chamber to a standstill when she launched the debate on the impeachment of President Donald Trump (AFP Photo/Saul LOEB) "Of course I was nervous," House Democrat Diana DeGette told AFP just outside the chamber, after presiding over the opening hours of debate on whether to charge Trump with abuse of power and obstruction of Congress. "It's a big responsibility, it's sobering, and I think the members feel that way too." Throughout a grave and fateful opening session, more than 400 lawmakers came face to face with their ultimate responsibility beyond sending US soldiers into battle: voting on whether to impeach a president. Republicans fiercely opposed to the Democratic effort threw up roadblocks to slow the process, but to no avail. It churned toward an evening vote in which the chamber's Democratic majority was expected to approve two articles of impeachment. Early in the day, some signs of normalcy and bipartisan decorum were still visible. Al Green, a House Democrat who first filed articles of impeachment against Trump back in 2017, collegially stood next to rival Republicans as they recited the Pledge of Allegiance. Freshman Republican Dan Crenshaw, a military veteran wounded in Afghanistan, made a point of shaking hands with Democrats. But the mood soon stiffened. Faces froze as a clerk began reading House Resolution 755: "Resolved, that Donald John Trump, president of the United States, is impeached for high crimes and misdemeanors." - 'Solemnity' - Nancy Pelosi, the speaker of the House who launched the impeachment inquiry nearly three months ago, struck a solemn figure, clad in a sober black suit, as she launched the debate. Passions built up quickly. "There is no proof -- none! -- that the president has committed an impeachable offense," boomed Republican congresswoman Debbie Lesko, her voice rising. Her colleagues seethed over "pure partisan politics" and the impeachment "sham" bringing shame on the House. And Republican Barry Loudermilk invoked religious imagery one week before Christmas, by saying that "Pontius Pilate afforded more rights to Jesus than the Democrats have afforded this president." "We do not hate Donald Trump," House Judiciary Committee chairman Jerry Nadler said later, drawing laughter from the Republican side. The push to impeach Trump has exposed the depth of the partisan divide in Washington and beyond. Most Republicans were absent from the chamber during key moments of the debate. At one point it appeared that fewer than 25 of the 197 House Republicans were in attendance. Democrats often fared little better. At the back of the chamber, a lonely figure: Justin Amash, the conservative who left the Republican Party to become an independent after declaring he believed Trump is unfit for office. Largely ignored by members of his former party, Amash was soon in animated conversation with Alexandria Ocasio-Cortez, the fiery and popular liberal first-time congresswoman. Democrat Gerry Connelly, stepping out for a break, said lawmakers "understood the solemnity of the moment" as the impeachment debate began. But he said he felt sad for Republicans, many of whom he counts as friends, because "they see and hear no evil when it comes to this president." "I feel a certain sense of relief that this is finally coming to a head, and a sense of humility that I'm here."