"Your statement is defamatory, and we demand that you retract it immediately," the letter reads.
"In making the statement, you knew it was false. Congresswoman Gabbard is not a Russian asset and is not being groomed by Russia,"the letter said. "Besides your statement, no law enforcement or intelligence agencies have claimed, much less presented any evidence, that Congresswoman Gabbard is a Russian asset. This fabricated story is so facially improbable that it is actionable as defamation."
Gabbard is also demanding that Clinton hold a press conference to "verbally retract" her remarks.
During an interview with David Plouffe, Clinton said of the Russians, "I think they've got their eye somebody who's currently in the Democratic primary and are grooming her to be the third-party candidate. She's a favorite of the Russians."