Las Vegas billionaire Sheldon Adelson has disavowed a campaign against National Security Adviser H.R. McMaster, which is being pushed by a group Adelson funds, the Zionist Organization of America.

Andy Abboud, who represents Adelson, tells me: "Sheldon Adelson has nothing to do with the ZOA campaign against McMaster. Had no knowledge of it. And has provided zero support, and is perfectly comfortable with the role that McMaster is playing."

Update: Abboud followed up with another phone call to clarify that Adelson doesn't know McMaster and hasn't developed an opinion about him. Adelson doesn't want his intervention to be interpreted as a political endorsement; but rather that he has had nothing to do with, and doesn't support, the campaign against McMaster.

Why this matters: Adelson is one of the biggest financial donors in Republican politics, and his influence over national security and Israel-related matters is substantial. His is a voice listened to by President Trump and other senior White House officials like Jared Kushner.