Three top allies of John Bolton resigned from President Donald Trump's administration on Wednesday, departing the White House a day after the former national security adviser left amid disputes with the President over a range of policy issues.

Garrett Marquis and Sarah Tinsley, who ran the National Security Council's press operation as senior directors for strategic communications, worked their last day at the White House on Tuesday, according to two people familiar with their decision who requested anonymity to discuss personnel matters. Christine Samuelian, who served as Bolton's personal assistant, also opted to depart the White House, according to one person familiar with the matter.

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"It was an honour to serve my country, and I wish the President and the administration success moving forward," Marquis said Wednesday.

The departure of Marquis and Tinsley thrusts the press operation of the National Security Council, responsible for communicating the White House's positions on a range of foreign policy issues, back onto uncertain ground. White House acting chief-of-staff Mick Mulvaney sought to ease concerns among members of the NSC staff in a meeting after Bolton's resignation on Tuesday, saying there would be no mass firings.