In a matter to reporters hours after Donald Trump sacked him in a twitter to the public, Mr Tillerson paid reverence to those who work in the department.
And he urged those who have been operative for him to “remain at their post and continue the mission”.
“We all took the same promise of office,” he said, adding: “We are all firm by that common joining – to support and urge the constitution… to bear loyal faith and devotion to the same, and to steadily liberate the duties of the office.”
Mr Tillerson was discharged following months of conjecture over the former ExxonMobil CEO’s position.
The President announced in a twitter that he had nominated CIA Director Mike Pompeo to take up the role, observant the 54-year-old “will do a illusory job”.
He went on to exhibit he had allocated Gina Haspel as Mr Pompeo’s successor, the first lady to take on the prestigious position.
Mr Trump told reporters that nonetheless he and Mr Tillerson “got along”, they had disagreements.
“Rex and we have been articulate about this for a prolonged time,” Mr Trump said.
“We got actually along utterly good but we disagreed on things,” he added, observant he thinks the US’ nuclear understanding with Iran is “terrible” since Mr Tillerson “felt a little bit differently”.
Mr Tillerson was sworn in as Secretary of State in Feb 2017.
In October, he was forced to repudiate he was considering quitting over tensions between him and the President.
The 65-year-old did not pronounce to Mr Trump before he was was sacked and has not been given a reason for his dismissal, a top help said.
“The Secretary did not pronounce to the President this morning and is unknowingly of the reason, but he is beholden for the event to serve, and still believes strongly that open service is a eminent pursuit and not to be regretted,” undersecretary of state Steve Goldstein said.
Mr Goldstein was after sacked for contradicting the White House, NBC reports.
In a matter announcing Mr Pompeo’s appointment, Mr Trump said: “I have gotten to know Mike very good over the past 14 months, and we am assured he is the right person for the pursuit at this vicious juncture.
“He will continue the programme of restoring America’s station in the world, strengthening the alliances, opposed the adversaries, and seeking the de-nuclearisation of the Korean Peninsula.”
Mike Pompeo, Director of the CIA, will turn the new Secretary of State. He will do a illusory job! Thank you to Rex Tillerson for his service! Gina Haspel will turn the new Director of the CIA, and the first lady so chosen. Congratulations to all!
— Donald J. Trump (@realDonaldTrump) Mar 13, 2018
Mr Pompeo released a matter observant he was “looking forward” to representing the President.
“I am deeply beholden to President Trump for needing me to offer as Director of the Central Intelligence Agency and for this event to offer as Secretary of State,” he said.
“His care has done America safer and we demeanour brazen to representing him and the American people to the rest of the universe to serve America’s prosperity.”
While some White House insiders explain Mr Pompeo tends to tell Mr Trump what he wants to hear, others contend they have been tender by his intellect, eagerness to listen and advocacy of some-more strong growth operations.
In another depart from the White House, John McEntee has been sacked as a personal help to the President.
Mr McEntee, one of a timorous organisation of campaign aides still operative in the West Wing, has rejoined Mr Trump’s re-election campaign as an adviser.