Trump National Security Council staffers purged, U.S. officials say

At least three senior staffers at the National Security Council have been fired, with more firings expected, two U.S. officials with knowledge tell CBS News. 

The sources were granted anonymity because they are not authorized to speak with the press. 

The firings came after rightwing personality Laura Loomer visited the Oval Office on Wednesday and presented President Trump with opposition research on NSC staffers whom she views as neoconservatives or not sufficiently loyal to the president, one of the sources said.