Trump ally Mark Meadows takes over the job, as Mr Mulvaney is sent to Northern Ireland as an envoy.
Read moreImpeachment of Donald Trump
The lawyer of a fired senior official hits back after President Trump attacks his client's record.
Read moreNick Bryant
New York correspondent
The new decade in American politics has started with a hangover that keeps on getting worse, says Nick Bryant.
Read moreTwo witnesses - security official Alexander Vindman and ambassador Gordon Sondland - were fired.
Read moreFrom the Iowa caucus mishap to his acquittal in the Senate, this week has treated the US president well.
President Trump and House Speaker Nancy Pelosi took aim at each other after his acquittal.
One day after his Senate trial ended, Mr Trump hosts a White House event to assail "corrupt" foes.
Read moreRepublicans, including Mr Trump, accuse their party's former presidential nominee of being a secret Democrat.
Read moreThe House Speaker said her actions were justified when she ripped up his State of the Union manifesto.
President Trump spoke at the White House to condemn the impeachment process.





