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 says he is unlikely to order Iran attack if talks progress
US President Donald Trump on Sunday said he was highly unlikely to order fresh attacks on Iran as long as talks to end the conflict progress, CNN reported.
Train collision in Egypt’s Giza province kills 7, injures dozens
Two passenger trains collided some 76 km south of Cairo on Sunday, killing at least seven people and injuring 112, Egypt’s health ministry said.
Saudi coalition says two Houthi missile launchers destroyed in Saada
The Saudi-led coalition said on Sunday it had destroyed two ballistic missile launchers in Yemen’s Saada province that were allegedly used in an attempted attack on Riyadh.
Saudi energy ministry confirms attempted attack on Aramco building in Riyadh
An official source at Saudi Arabia's Ministry of Energy confirmed on Sunday that an administrative building belonging to state oil giant Saudi Aramco in Riyadh had been targeted in an attempted attack.
COP31 climate summit to open in Turkey on Monday
The 31st UN Climate Change Conference will begin in Antalya on Monday, bringing together world leaders, senior officials, academics and civil society representatives.
6:00am - 10:00am
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