Donald Trump December 14, 2018 6:07 pm Trump Names Mick Mulvaney Acting Chief of Staff President Donald Trump announced on twitter Friday that Mick Mulvaney will take over as acting chief of staff, replacing John Kelly. US & World Videos 3:32 Biden on campus protests: ‘Order must prevail' 24:50 @Issue: Biden signs the foreign aid bill, and a retrospective of Boston's 2024 Olympics bid 2:15 Opening statements made, witnesses called in hush money trial against Donald Trump 24:46 @Issue: Trump “hush money” trial underway 2:08 Boston announces first chief climate officer