In a letter sent to the president on Tuesday and obtained by POLITICO, Nadia Schadlow said she is stepping down from the NSC effective April 27, saying she would "help with the transition" of Bolton, who started Monday as President Donald Trump's national security adviser. One of the two people said Bossert gave no indication he was leaving the administration, but at one point joked that he was unsure of his future “like everyone else who works for Trump.”

Bossert ran the administration’s work on cyber security issues and was considered a key voice for responding more aggressively to destructive cyber attacks launched by hostile adversaries, including Russia, Iran and North Korea. White House spokesperson Raj Shah says the administration thanks Schadlow for “her service and leadership” and says, “We wish Nadia and her family the best.”

She’s one of a handful of high-level staffers who’ve chosen to leave or been pushed out since Bolton’s appointment. The White House's deputy national security adviser for strategy has resigned, the third senior National Security Council official to announce exit plans since John Bolton took the helm, a spokesman confirmed Wednesday.
U.S. Homeland Security Advisor Tom Bossert resigns at the request of National Security Advisor John R. Bolton.