It follows reports that President Trump was outraged by comments made by Mulvaney during the Ukraine corruption saga.
The allegations of abuse of power over the Ukraine incident led to impeachment proceedings against President Trump.
Mulvaney's departure has been on the cards for the last few weeks.
Mr Mulvaney is to become US special envoy to Northern Ireland, while North Carolina lawmaker Mark Meadows has been appointed to take over his former position.
King Charles to resume public duties after cancer diagnosis
Britain's King Charles will return to public duties next week for the first time since being diagnosed with cancer as he makes good progress following treatment and a period of recuperation, Buckingham Palace said on Friday.
India's top court declines to order any change to vote-counting process
India's Supreme Court has declined to order any change to the vote-counting process, rejecting petitions seeking a return to the ballot system or to tally all paper slips generated as proof of voting for votes recorded by electronic machines.
Fire at Brazil guesthouse leaves at least 10 dead
At least 10 people died and 11 were injured in the early hours of Friday morning in a major fire at a guesthouse in Brazil's southern city of Porto Alegre.
Gaza baby saved from dead mother's womb dies
A baby, who was delivered from her dying mother's womb in a Gaza hospital following an Israeli airstrike, has died after just a few days of life, the doctor who was caring for her said on Friday.
India begins voting in second phase of giant election
India began voting on Friday in the second phase of the world's biggest election, as Prime Minister Narendra Modi seeks a record-equalling third straight term.
7:00am - 10:00am
Dubai Eye complements the conversation with the music you love from the eighties, nineties and newer.
10:00am - Noon
John Lyons of Espace Real Estate says there is a slight slowdown in the property market during summer. So we asked him, does this mean prices are negotiable during the summer months?
Lawyer Rebecca Kelly of Clyde & Co. explained why UAE judicial authorities are setting up new offices to deal with financial crime, including money laundering.
Airalo - an eSim company disrupting telco's roaming revenues, has raised $60 million in funding including investment from our own e&.
It sounds like an episode of The Jetsons, but the sight of flying taxis whizzing around our cities could be much closer than you think.
The UAE has said that tougher penalties will come into force from 1st August for not keeping proper corporate tax records.
