Nielsen, a protégé of Kelly who became the secretary at Homeland Security when he left the job to become Trump's chief of staff, is expected to leave her job in the coming weeks, ABC News reported, although it was not immediately clear when these personnel changes would be made.
Trump is considering replacing Kelly with Vice President Mike Pence's chief of staff, Nick Ayers, ABC News said.
Kelly, a retired Marine Corps general, has worked to bring more stability to White House operations under the unpredictable Trump. During much of Kelly's time in the chief of staff role, the pair has had a rocky relationship, a fact that was highlighted in Bob Woodward's best-selling book "Fear: Trump in the White House."
Trump, who has been focused on toughening immigration policies, also has been said to have been unhappy with Nielsen's efforts to tighten the border.
The White House and the Department of Homeland Security did not immediately respond to requests for comment. (Reporting by Tim Ahmann and Makini Brice; Editing by Susan Heavey and Bill Trott)
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