WASHINGTON — Quarreling and confusion marked the Senate hearing Tuesday for Supreme Court nominee Brett Kavanaugh, with politically charged arguments about White House documents and process getting as much attention as the role the conservative judge would likely play in shaping rulings on abortion, executive power and other national issues.

Strong Democratic opposition to President Donald Trump’s nominee reflected the political stakes for both parties just two months before congressional elections. The Democrats, including several senators poised for 2020 presidential bids, tried to block the proceedings over Kavanaugh records being withheld by the White House. Republicans in turn accused the Democrats of turning the hearing into a circus. And protesters shouted out frequent and persistent disruptions from the audience.

After hours silently listening to the partisan exchanges, Kavanaugh rose to be sworn in and give opening remarks. He stressed the court’s independence at a time when Democrats say he was picked because Trump believes the judge’s expansive views of executive power will help the president in investigations.

“Our independent Judiciary is the crown jewel of our constitutional republic,” Kavanaugh told the senators. “The Supreme Court is the last line of defense for the separation of powers and the rights and liberties guaranteed by the Constitution.”

He said, “The Supreme Court must never, never be viewed as a partisan institution.”

The 53-year-old judge choked up when talking about his family, particularly his parents, and drew chuckles from the room in naming all the girls he coaches on his daughter’s basketball team.

Democrats raised objections to the nomination from the moment Chairman Chuck Grassley gaveled the Judiciary Committee to order. Several, including Kamala Harris of California, Cory Booker of New Jersey and Amy Klobuchar of Minnesota, all potential presidential contenders, demanded that Republicans delay the hearing. They railed against the unusual vetting process by Republicans that failed to include many documents from three years Kavanaugh worked in the George W. Bush administration, and 100,000 more pages withheld by the Trump White House. Some 42,000 pages were released on the evening before of the hearing.

“We cannot possibly move forward, Mr. Chairman, with this hearing,” said Harris at the top of proceedings. Grassley disagreed.

As protesters repeatedly interrupted the session, Republican Sen. Ted Cruz, who is fighting for his own re-election in Texas, apologized to Kavanaugh for the spectacle he said had less to do about the judge’s legal record than Trump in the White House.

“It is about politics,” said Cruz. “It is about Democratic senators re-litigating the 2016 election.”