Here is a list of those who were in the Trump White House from day 1 and have since quit, or been fired (via ABC News). There have been more first-year departures from this White House than any in 40 years (Axios).
Gary Cohn–chief economic adviser
Hope Hicks–communications director
Rob Porter–staff secretary
Omarosa Manigault-Newman–Dir. of comm. for the Office of Public Liaison
Dina Powell–deputy national security adviser
Tom Price–Secretary of Health and Human Services
Sebastian Gorka–deputy assistant to the president
Steve Bannon–chief strategist and senior counselor
Katie Walsh–White House deputy chief of staff
Andrew McCabe–FBI deputy director
Anthony Scaramucci–communications director
K.T. Mc Farland–deputy national security adviser
Josh Raffel–senior communications official
Reince Priebus–chief of staff
Sean Spicer–press secretary
Walter Shaub–director of the office of government ethics
Mike Dubke–communications director
James Comey–FBI director
Mike Flynn–national security adviser
Sally Yates–acting attorney general
"There is no Chaos, only great Energy!": President Trump dismisses claims that his White House is in chaos amid reports of high-profile departures and discord within the top ranks of the West Wing https://t.co/s9zduAPCMy pic.twitter.com/dD5EQJkMGi
— CNN (@CNN) March 6, 2018