Two-dozen U.S. senators on Monday will urge the U.S. Food and Drug Administration to scrap a policy that bans blood donations from many gay men, saying that the mass shooting at an LGBT nightclub in Orlando last week underscored how the policy discriminates on the basis of sexual orientation.

“The atrocities in Orlando are now understood to be the largest mass shooting in U.S. history, where 49 victims were killed and another 53 were wounded, most of them critically,” said a copy of the letter, led by Senators Tammy Baldwin of Wisconsin and Elizabeth Warren of Massachusetts, which was provided to BuzzFeed News.

“Yet, some of those most touched by this tragedy — members of the LGBT community, who are especially eager to contribute to the response effort — are finding themselves turned away,” said the letter to the FDA commissioner, from 23 Democrats and one Republican.

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