"I appreciate his service very much".
Mr Kelly's replacement might be an interim chief of staff until a permanent successor is found, the Republican president said. Nick Ayers, the vice president's chief of staff, is seen as a leading candidate.
Most of the other witnesses interviewed were connected to Trump's campaign, but Kelly didn't join the administration until after the president was sworn in in January 2017.
A separate report from ABC says a White House senior staff meeting this morning was cancelled.
Rap star Kendrick Lamar, women nominees lead Grammy race
He didn't run away with the crown, though, as Drake was right behind him with seven nominations of his own. But the big news is the high number of women nominees, after being largely left out previous year .
All of the people asked not to be identified discussing a sensitive internal White House matter. The retired Marine Corps general has spent 16months in the position. In 2017, Politico report cited three USA government officials who said Kelly's cellphone was compromised throughout the first half of that year, with the suspected breach potentially happening even before he began serving as secretary of the Department of Homeland Security in January.
This story is breaking and being updated.
He announced Friday that he'll nominate William Barr, who served as attorney general under President George H.W. Bush, to the same role in his administration. Kelly's highly criticized handling of the Porter controversy was an inflection point in his tenure, and some of his internal relationships became strained in the months that followed the former staff secretary's ouster.