During that testimony, according to the New York Times, she told House investigators that her role occasionally required her to tell "white lies" for the President, but that she had never lied about anything related to the investigation into Russian interference in the 2016 election and possible collusion between Russia and the Trump campaign.
Hicks reportedly admitted to lawmakers she would tell "white lies" to cover for Trump, over which POTUS allegedly berated her at the White House on Wednesday.
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.
Kellyanne Conway, counselor to President Trump, tweeted "I love you and will miss you, Hope Hicks". And how might she navigate these issues now that she is no longer in the White House? After Trump took office, Hicks's name rarely appeared in the frequent reports of internal backbiting and power struggles in the White House.
"Breaking news, White House in turmoil".
Hicks managed in many ways to stay above the fray of staff backbiting and palace intrigue that has characterized the Trump White House, but her proximity to the president has made her a central figure in some of its more dramatic moments.
Hicks, who at the time was dating Porter, did not recuse herself from the matter.
In the hours before Hicks' arrival, Trump tweeted several times, quoting cable news commentators who said they hadn't seen evidence of collusion between Trump and Russian Federation. "I wish the president and his administration the very best as he continues to lead our country". She is a direct witness to much of the day-to-day goings on in the White House.
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Hicks, 29, had the high-pressure job last summer of crafting, with the president, an explanation for his son Donald Trump Jr's secret meeting with Russians at Trump Tower in NY in 2016 - an explanation later revealed as false.
Months later, Hicks allegedly helped draft a rather misleading press release about the nature of that meeting. "She totally understands him".
Hicks also came under fire more recently over her involvement in crafting the White House's initial defense of Rob Porter, the White House staff secretary who resigned in disgrace after two of his ex-wives publicly accused him of domestic abuse.
At age 13, Ms Hicks told Greenwich Magazine, for a cover story about the Hicks sisters' modelling careers, that she was "not ready to decide if modelling is what I want to do with my life".
Other members of Trump's team and past team members commented on her leaving.
It's unclear at this point who will be the next communications director.
Hicks provided limited information to the House Intelligence Committee on Tuesday, when she sat before the committee for nine hours. From there, the former political novice was introduced to Donald Trump and was tapped to be the press secretary for his campaign in January 2015.