https://www.nbcnews.com/politics/white-house/report-felons-people-under-foreign-influence-got-national-security-clearances-n840226
Under U.S. law, the president has the authority to grant security clearance to whomever he sees fit, regardless of the FBI's findings. A former White House official who served in the Obama administration said it was the policy of that White House not to override the recommendations of the FBI when it came to hiring decisions for White House positions.