UPDATED: February 28, 2018  7:10 PM

WASHINGTON (CBS NEWS/AP) – White House Communications Director Hope Hicks, one of President Donald Trump’s most loyal aides, is resigning.

That’s according to a White House official briefed on her plans but not authorized to discuss them publicly.

gettyimages 924951308 White House Communications Director Hope Hicks Resigning

WASHINGTON, DC – FEBRUARY 27: White House Communications Director and presidential advisor Hope Hicks (2nd L) arrives at the U.S. Capitol Visitors Center February 27, 2018 in Washington, DC. Hicks is scheduled to testify behind closed doors to the House Intelligence Committee in its ongoing investigation into Russia’s interference in the 2016 election. (Photo by Chip Somodevilla/Getty Images)

The news comes a day after Hicks was interviewed for nine hours by the panel investigating Russia interference in the 2016 election and contact between Trump’s campaign and Russia.

She acknowledged to a House intelligence panel that she has occasionally told “white lies” for Trump. But she said she had not lied about anything relevant to the Russia investigation.

Hicks served as Trump’s one-woman communications shop during his winning campaign and has remained one of his most trusted aides.

She said in a statement, “There are no words to adequately express my gratitude to President Trump.”

The former model started her career working for Ivanka Trump and soon became part of the family business. She was one of the first people the president informed of his intent to run for office.

“I said, ‘What do you know about politics?’ She said, ‘Absolutely nothing,'” Mr. Trump said. “I say, ‘Congratulations, you’re into the world of politics, right?’ She knew nothing and she was there the first day and she was fantastic.”

Hicks was by Mr. Trump’s side through some of the rockiest moments on the campaign trail — and had been working just outside the Oval Office.

In a statement, the president praised Hicks for her work over the last three years. He says he “will miss having her by my side.”

(© Copyright 2018 CBS Broadcasting Inc. All Rights Reserved. The Associated Press contributed to this report.)