Representatives from Google and Facebook didn’t respond to questions about whether they’d received invitations. A spokeswoman for Twitter Inc. declined to comment.

Liberal groups say internet platforms don’t do enough to stop the spread of hate speech or police political disinformation from foreign and domestic operatives. Conservatives say the tech companies censor right-wing viewpoints.

Both groups seek changes to the shield that would increase companies’ liability as a solution. Lawmakers and tech policy experts from both sides of the aisle worry about children’s safety online as well as drug sales, harassment and stalking, among other issues.

“A lot of people are angry for different reasons at the large platforms,” said Jeff Kosseff, a professor at the U.S. Naval Academy who has written a history of the law and is also scheduled to address the workshop. “Section 230 is a pretty attractive proxy for that anger.”

While the Justice Department can make recommendations, only Congress can change the law. Some legal experts say they are perplexed by the department’s role in the Section 230 debate, which doesn’t tie the government’s hands in prosecuting violations of criminal law.

“DOJ is in a weird position to be convening a roundtable on a topic that isn’t in their wheelhouse,” said Eric Goldman, a professor at Santa Clara University School of Law and longtime defender of Section 230, who is also set to speak.

Lawmakers are exploring an array of possible changes to the law, looking to use it to make companies police content in a politically “neutral” manner, rein in use of the shield by short-term home-rental companies or protect voters from misinformation. Democratic presidential hopefuls including former Vice President Joe Biden have weighed in with calls to repeal or change the law.

When it comes to cases where online material exploits children, a draft bill from Republican Senator Lindsey Graham of South Carolina, a top Trump ally, would only allow the companies to keep the liability shield if they follow a set of best practices. For example, they would be required to report and delete the material, but also preserve it for law enforcement. Critics worry that the measure would also undermine encrypted communications because encoded platforms can’t see what material the law would prompt them to report.

In 2018, in the first successful effort to chip away at the shield, Congress eliminated the liability protection for companies that knowingly facilitate online sex trafficking.

The critics propose a range of changes -- from raising the bar on which companies can have the shield, to carving out other laws, to repealing Section 230 entirely. Uniting them, however, is the belief that the provision enables an online environment rife with political misinformation, drug dealing, child abuse and other ills.