Trump says of Gabbard, "she's not a Russian agent."
Clinton appeared to call Gabbard "the favorite of the Russians" in a recent interview, saying she believes the Russians have "got their eye on somebody who's currently in the Democratic primary and are grooming her to be the third-party candidate."
Speaking during a Cabinet meeting Monday, Trump says Clinton and other Democrats claim everyone opposed to them is a Russian agent.
He adds: "These people are sick."
Trump says he thinks Clinton's attack boosts Gabbard and his own political chances, claiming it shows concerns about Russian interference are just a "sham."
U.S. intelligence agencies unanimously assessed that Russia interfered in the 2016 election.