The departure of one of the president's longest-serving advisers, who worked as a one-woman communications shop during his winning campaign, came as a surprise to most in the White House -- and cast a pall over the West Wing at a tumultuous time.
The news comes a day after Hicks was interviewed for nine hours by the House panel investigating Russia interference in the 2016 election and contact between Trump's campaign and Russia.
In a statement, Trump praised Hicks for her work over the last three years, saying he "will miss having her by my side."
She began her White House tenure as director of strategic communications -- a title that only partly captured her more expansive role as the president's gatekeeper to the press.
Hicks acknowledged to a House intelligence panel Tuesday that she has occasionally told "white lies" for Trump. But she said she had not lied about anything relevant to the Russia investigation.
She has also been interviewed by special counsel Robert Mueller, in his expansive probe of Russian interference of the 2016 election and potential misdeeds committed by those in the president's orbit.
A former Ralph Lauren fashion model and public relations pro who worked for Trump's daughter Ivanka, Hicks, 29, had no political background when Trump asked her to serve on his campaign.
Before today's announcement, Hicks had not been happy for some time, said one person with knowledge of her thinking who was not authorized to discuss the matter publicly. That person said Hicks had been increasingly feeling the stress of the position.
Hicks helped craft the White House's initial supportive response.
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