Tillerson was frequently at odds with the mercurial president. They notably disagreed on the Iran nuclear deal, from which Trump withdrew in May.
During his brief stay at Foggy Bottom, Tillerson frequently found himself out of the loop and caught unawares by policy shifts announced in Trump tweets.
In one of his first public criticisms of the president since stepping down, Tillerson told a gathering in Texas earlier this month that Trump was undisciplined, did not like to read briefing papers and sometimes asked him to do things that were illegal.
Trump shot back on Twitter that Tillerson was "dumb as a rock."
- Chief strategist Steve Bannon -
The architect of Trump's nationalist-populist campaign and his election victory, White House chief strategist Steve Bannon was nicknamed the Prince of Darkness and the Shadow President.
His economic nationalism became the lynchpin of Trump policies, even as many of Bannon's other ideas were rebuffed by policy rivals.
Bannon's constant clashes with other advisors became untenable, as did his ties to the extreme right. Bannon left in August 2017.
- National Security Advisors Flynn, McMaster -
Michael Flynn, a retired lieutenant general, was being investigated for his contacts with Russians and eventually pleaded guilty to lying to the FBI.
He lasted only 22 days as national security advisor.
Flynn's replacement, HR McMaster, also a lieutenant general, lasted barely a year.
He never really clicked with the president, who bristled at McMaster echoing the US intelligence establishment consensus that Russia meddled in the 2016 election.
