(CNN) Joe Biden's presidential campaign is now asking Twitter to reject a video ad from President Donald Trump's reelection campaign that falsely accuses the former vice president of corruption for his role in Ukraine policy during the Obama administration.

In the letter, first obtained by CNN, the Biden campaign asks Twitter to reject the ad should the campaign place it again. While the letter, written by Biden campaign manager Greg Schultz, acknowledges that the social media company has said the ad complies with its policies, he asks that Twitter "promptly reassess" that position.

Specifically, the letter calls on Twitter to make a distinction between the personal account of a politician and paid advertising content -- "just as Twitter does in every other context," per the letter.

Twitter has not responded to CNN's request for comment.

The move from Biden's team appears to be part of a broad campaign to respond to Trump's attacks on social media. The campaign wrote a letter to Facebook asking the social media company to remove the Trump campaign ad, a request that Facebook rejected on Tuesday night.

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