President Donald Trump announced on Saturday that his chief of staff John Kelly would be leaving the position by the end of the year. Kelly's departure has been expected, according to sources within the White House. His tenure has been marred by conflict since he took the position in the summer of last year. Reports have described disagreements between Kelly, the president and West Wing staff. Recent clashes with first lady Melania Trump made his already tenuous position even more so, NBC News reported last month.