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.
Trump dismisses Iran's reply to peace plan, oil jumps as Hormuz closure persists
President Donald Trump's swift rejection of Iran's response to a US peace proposal sent oil prices surging on Monday amid concerns the 10-week-old conflict will drag on, keeping shipping through the Strait of Hormuz paralysed.
Evacuation of passengers from virus-hit cruise ship to be completed on Monday
The evacuation of passengers from a Dutch-flagged luxury cruise ship hit by a deadly hantavirus outbreak will be completed on Monday with flights from Australia and the Netherlands, Spain's health minister has said.
Six people found dead in boxcar in Texas, police say
Six bodies were found on Sunday in a train boxcar in Laredo, Texas, according to police, with an investigation ongoing to determine the cause of death.
Turkish Airlines plane evacuated due to tyre fire after landing in Kathmandu
A tyre of a Turkish Airlines plane caught fire after it landed on Monday in Nepal's capital of Kathmandu, authorities said, forcing the closure of the airport for an hour.
Thailand's former PM Thaksin Shinawatra released from prison
Thailand's influential former Prime Minister Thaksin Shinawatra has been released from prison on Monday, after about eight months behind bars following a court ruling that deemed he had wrongfully stayed in hospital to avoid jail time.
Iran sends its response to US proposal aimed at ending the war
Iran has sent its response to a US proposal for peace talks to end the war, Iranian state media reported on Sunday, as two ships were allowed to pass through the blockaded Strait of Hormuz.
Ukraine, Russia ceasefire strained as both sides report weekend attacks
A US-mediated ceasefire between Russia and Ukraine appeared under serious strain on Sunday, with both sides trading blame for weekend attacks.
Evacuation flights leave Tenerife after cruise ship virus outbreak
Groups of passengers and crew disembarked from a cruise ship hit by a deadly hantavirus outbreak on Sunday to be evacuated to their home countries where they will isolate according to national protocols to prevent further spread of the disease.
Stronger Than Before
Jessica Sanchez, Morissette
Bittersweet
Madison Beer
Pahuway
Rain
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How did Lightning Scientific Arnis International Dubai begin here in the UAE? What are the main skills and disciplines learned in Arnis training? #pinoytribe #TagPuyatanNa
