Facebook Inc.'s Mark Zuckerberg and Twitter Inc.'s Jack Dorsey will face accusations from Republican senators that the companies censor conservative content, after several of President Donald Trump's social-media posts claiming voter fraud were labeled as false or misleading in the wake of the election.

The chief executive officers of the social networks are scheduled to testify before the Senate Judiciary Committee on Tuesday in their second congressional appearance in a month to defend themselves against charges of silencing conservatives.

The session is likely to focus on Twitter and Facebook's handling of Trump's statements about the election process and outcome, many of which have been labeled as false or misleading, as well as their treatment of an October story in the New York Post that was seen as potentially damaging to Democrat Joe Biden.

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