WASHINGTON (AP) — Robert F. Kennedy Jr. worked to defend himself Thursday against accusations that he traffics in racist and hateful online conspiracy theories, testifying at a House hearing on government censorship despite requests from outside groups to disinvite the Democratic presidential candidate after his recent antisemitic remarks.

The Republican-led Select Subcommittee on the Weaponization of the Federal Government is amplifying GOP claims that conservatives and others are being unfairly targeted by technology companies that routinely work with the government to try to stem the spread of disinformation online. Democrats argued that free speech comes with responsibilities not to spread misinformation, particularly when it fans violence.

In opening remarks, Kennedy invoked his famous family's legacy in decrying the complaints of racism and antisemitism against him.

"This is an attempt to censor a censorship hearing," said Kennedy, the son of Robert F. Kennedy and the nephew of President John F. Kennedy.

Growing animated at times, Kennedy defended his statements, which have delved into race, vaccine safety and other issues, as neither "racist or antisemitic." He said his family has long believed in the First Amendment right to free speech.

"The First Amendment was not written for easy speech," Kennedy said. "It was written for the speech that nobody likes you for."

Republicans are eager to elevate Kennedy after he announced in April he was mounting a long-shot Democratic primary challenge to President Joe Biden. Kennedy's presidential campaign chairman, Dennis Kucinich, the former congressman and past presidential contender, sat in the front row behind him during the more-than-three-hours hearing.

The Big Tech companies have adamantly denied the GOP assertions and say they enforce their rules impartially for everyone regardless of ideology or political affiliation. And researchers have not found widespread evidence that social media companies are biased against conservative news, posts or materials.

The top Democrat on the House panel, Del. Stacey Plaskett of the Virgin Islands, said the Republican majority was giving a platform to Kennedy and others to promote conspiracy theories and a rallying cry for "bigotry and hate."

"This is not the kind of free speech I know," Plaskett said.

Plaskett warned against misinformation from Russia and other U.S. adversaries who have interfered in American elections and are expected to meddle again in the 2024 election.

Often emotional and heated, Thursday's hearing came as subcommittee chairman Jim Jordan, R-Ohio, portrayed what he claimed were examples of censorship, including a White House request to Twitter to remove a race-based post from Kennedy about COVID-19 vaccines.

"It's why Mr. Kennedy is running for president — it's to stop, to help us expose and stop what's going on," Jordan said.

A watchdog group asked Jordan to drop the invitation to Kennedy after he suggested COVID-19 could have been "ethnically targeted" to spare Ashkenazi Jews and Chinese people.

In those filmed remarks first published by The New York Post, Kennedy said "there is an argument" that COVID-19 "is ethnically targeted" and that it "attacks certain races disproportionately."

After the video was made public, Kennedy posted on Twitter that his words were twisted and denied ever suggesting that COVID-19 was deliberately engineered to spare Jewish people. He called for the Post's article to be retracted.

A clip from the video was aired at the hearing.

Kennedy has a history of comparing vaccines — widely credited with saving millions of lives — with the genocide of the Holocaust during Nazi Germany, comments for which he has sometimes apologized.

In heated exchanges, Democrats implored Kennedy and Republicans to consider the fallout from their words and actions — and noted that one of the posts Republicans had singled out at the hearing was not removed by any censors.

"Hate speech has consequences," said Rep. Gerry Connolly, D-Va., who made reference to the mass shooting at a Pittsburgh synagogue, among others. He called the hearing Orwellian.

Rep. Sylvia Garcia, D-Texas, said she received a death threat after the last hearing of the Weaponization panel.

When Rep. Debbie Wasserman Schultz, D-Fla., read aloud Kennedy's postings and questioned his intent, Kennedy interjected that she was "slandering me" and claimed what the congresswoman was saying was a lie.

An organization that Kennedy founded, Children's Health Defense, currently has a lawsuit pending against a number of news organizations, among them The Associated Press, accusing them of violating antitrust laws by taking action to identify misinformation, including about COVID-19 and COVID-19 vaccines.

Ahead of the hearing, Jordan said that while he disagreed with Kennedy's remarks, he was not about to drop him from the panel. Speaker Kevin McCarthy took a similar view, saying he did not want to censor Kennedy.

The panel wants to probe the way the federal government works with technology companies to flag postings that contain false information or downright lies. Hanging over the debate is part of federal communications law, Section 230, which shields technology companies like Twitter and Facebook from liability over what's said on their platforms.

Lawmakers on the panel were also hearing testimony from Emma-Jo Morris, journalist at Breitbart News, who has reported extensively on Biden's son, Hunter Biden; and D. John Sauer, a former Solicitor General in Missouri who is now a special Assistant Attorney General at the Louisiana Department of Justice involved in the lawsuit against the Biden administration.

Morris tweeted part of her opening remarks in which she described an "elaborate censorship conspiracy" that she claimed sought to halt her reporting of Hunter Biden.

A witness called by Democrats, Maya Wiley, the president and CEO of the Leadership Conference on Civil and Human Rights, implored the lawmakers to consider the platforms where Americans share views — but also "how deeply vital that they be based in fact, not fiction."

The U.S. has been hesitant to regulate the social media giants, even as outside groups warn of the rise of hate speech and misinformation that can be erosive to civil society.

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