WASHINGTON (REUTERS) - US Health and Human Services Secretary Tom Price resigned under pressure from President Donald Trump on Friday (Sept 29) in an uproar over his use of costly private charter planes for government business.

Price is the latest of the officials who have been fired or have left the administration since Trump took office on Jan 20. Here's a list of these officials:

Stephen Bannon

The chief strategist, who had been a driving force behind the president's anti-globalisation and pro-nationalist agenda that helped propel him to election victory, was fired by Trump in mid-August. He had repeatedly clashed with more moderate factions in the White House.

Sean Spicer

He resigned as White House press secretary in July, ending a turbulent tenure after Trump named Anthony Scaramucci as White House communications director.

Anthony Scaramucci

The communications director was fired in July after just 10 days on the job after his profanity-laced comments to The New Yorker magazine were published.

Reince Priebus

The former chairman of the Republican National Committee was replaced by John Kelly as chief of staff in July. A confidant of the president said Trump lost confidence in Priebus after major legislative items failed to pass the US Congress.

James Comey

The Federal Bureau of Investigation director leading a probe into possible collusion between the Trump presidential campaign and Russia to influence the election outcome was fired by Trump in May.

Michael Flynn

He resigned in February as Trump's national security adviser after disclosures that he had discussed US sanctions on Russia with the Russian ambassador to the United States before Trump took office and misled Vice-President Mike Pence about the conversations.

Sally Yates

The acting attorney-general was fired by Trump in January after she ordered Justice Department lawyers not to enforce his immigration ban.

Michael Short

The senior White House assistant press secretary resigned in July.

Walter Shaub

The head of the US Office of Government Ethics, who clashed with Trump and his administration, stepped down in July before his five-year term was to end.

Caroline Wiles

Trump's director of scheduling resigned in February after failing a background check, according to Politico.

Robin Townley

An aide to national security adviser Flynn, he was rejected in February after he was denied security clearance to serve on the US National Security Council, according to Politico.

Michael Dubke

The founder of Crossroads Media resigned as White House communications director in May.