Lawyers representing Rep. Tulsi Gabbard on Monday called on Hillary Clinton to retract her comments alleging that the 2020 presidential candidate was a favorite candidate of the Russians, accusing the 2016 Democratic nominee of defamation.

“Your statement is defamatory, and we demand that you retract it immediately,” Gabbard’s lawyer wrote in a letter, demanding that Clinton verbally retract the comments and post the retraction on Twitter.

Clinton’s spokesman declined to comment on the letter.

Read more at The Hill.