Stephanie Grisham, U.S. First Lady Melania Trump’s chief of staff, says she is resigning effective immediately.
A longtime associate of Mrs Trump, Grisham was also a former White House spokeswoman.
She said it had been an honour to serve the Trump administration.
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Grisham gave no reasons for her unexpected move.
It remained unclear whether her departure was related to the storming of the Capitol by supporters of outgoing president Donald Trump.