Facebook Inc."s Mark Zuckerberg and Twitter Inc."s Jack Dorsey will be forced to defend themselves from accusations by Republican senators that their labeling of President Donald Trump"s social-media posts claiming voter fraud as false or misleading amounts to censorship of conservative content.

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.

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