After troubled tenure, Trump ousts Tillerson for Pompeo

US President Donald Trump on Tuesday said he had replaced US Secretary of State Rex Tillerson with Central Intelligence Agency Director Mike Pompeo, and had tapped Gina Haspel to lead the CIA.

Related: Trump says he's prepared to meet North Korea's Kim Jong-un in first-ever such meeting

The resignation represents the biggest shakeup of the Trump Cabinet so far and had been expected since last October when reports surfaced about a falling out between Trump and Tillerson, 65, who left his position as chief executive of Exxon Mobil to join the administration.

US stock index futures pared their gains and the dollar also trimmed gains versus the yen while extending losses versus the euro amid the news.

Related: Trump's 'insulting' treatment of Kelly and McMaster might drive both from White House

Trump publicly undercut Tillerson's diplomatic initiatives numerous times, including on Monday when the former secretary of state's comments about Russia appeared to be at odds with those of the White House. 

Tillerson also appeared out of the loop last week when Trump announced he would meet with North Korea's leader and become the first sitting US president to do so.

"Mike Pompeo, Director of the CIA, will become our new Secretary of State. He will do a fantastic job! Thank you to Rex Tillerson for his service! Gina Haspel will become the new Director of the CIA, and the first woman so chosen. Congratulations to all!" Trump said on Twitter. 

Related: 'This guy is insane': An inside look at White House politics

By Susan Heavey and Paul Simao. Reporting by Susan Heavey and Doina Chiacu; Editing by Bill Trott