He became the longest-tenured aide after White House communications director Hope Hicks announced her resignation on Wednesday. Hicks said there were "no words to adequately express" her gratitude to President Donald Trump.
Trump praised Hicks as outstanding and said she has done great work.
The top Democrat on yesterday's intelligence panel, Adam Schiff, said after the meeting was over that Hicks answered questions about her role in Trump's campaign and answered some questions about the transition period between the election and the inauguration. "I will miss having her by my side". She is a former model who started working for the Trump Organisation in 2014, initially promoting Ivanka Trump's clothing line and later as press secretary for Mr Trump.
Hicks' proximity to Mr. Trump has made her of particular interest to special counsel Robert Mueller and the congressional intelligence committees as they investigate Russian election meddling and any ties to Trump associates.
She worked to defend him when charges of domestic abuse against his two former wives emerged. Perhaps she's off to work in some arm of Trump's company again?
It took two years for Hicks to land a fast-track public relations job in NY city after her graduation from Southern Methodist college, according to a 2016 GQ profile.
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During her appearance before the House Intelligence Committee, Trump's communications director had stuck to answering pre-approved questions, and refused to answer numerous other questions put to her.
Nonetheless, White House spokeswoman Sarah Sanders stressed that the timeline for Hick's departure is unclear. "This is a breathtakingly broad claim a privilege that I don't think any court would sustain, and I think the White House knows that".
Porter resigned a day after one of his exes released a photo showing her battered face.
In the hyper-speed world of Donald Trump's political career, Hope Hicks showed unusual staying power, lasting longer with the president, and staying closer to him, than anyone else lacking physical participation in his bloodline.
She was an unconventional press secretary, rarely mixing it up with reporters, nearly never giving interviews and, despite Trump's fondness for cable, staying off TV.
Hicks was dating Porter at the time.
She reportedly added that these lies were never about serious, or legal, issues.
Hicks' departure follows that of a succession of senior administration figures: from national security advisor Michael Flynn, to Reince Priebus as chief of staff, Sean Spicer as press secretary and Steve Bannon as the president's chief strategist.