K. T. McFarland has been asked to step down as deputy National Security Advisor to President Donald Trump after less than three months and is expected to be nominated as ambassador to Singapore, according to a person familiar with White House personnel moves.

The departure of the 65-year-old former Fox News commentator comes as Trump’s second National Security Advisor, H.R. McMaster, puts his own stamp on the National Security Council after taking over in February from retired General Michael Flynn.

McFarland proved not to be a good fit at the NSC, the person said, adding that Homeland Security Secretary John Kelly was involved in the decision as well.

Her removal follows a reorganization of the NSC in the past week that removed Stephen Bannon, Trump’s chief strategist and senior counselor, from the principals committee, the Cabinet-level interagency forum that advises the president on pressing security matters.