McEntee was one of Trump's longest-tenured staffers, having joined during the campaign.
Before McEntee was working for Trump, he was a viral star, known for a trick-shot compilation video he released while he was quarterback for the UConn Huskies in 2011.
Part of McEntee's duties were to make sure Trump had markers to sign autographs, deliver messages to him in the White House residence and, over the weekend, ensure that the clocks in the White House residence were set at the correct time for daylight-saving time, the Journal reported.
He made headlines during Trump's May visit to Saudi Arabia as the "man in red tie".
McEntee declined a CNN request to comment.
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Kelly sought to limit access to classified information for aides with longstanding interim security clearances and several aides have since left the White House after it became clear their applications for a full security clearances would not be approved.
Details of Mr McEntee's dismissal have been scarce, with only a foreboding report that he was under investigation for "serious financial crimes" - ones not tied to any current Trump controversies. The White House did not comment on the firing. The role meant McEntee was almost constantly at the President's side.
The Wall Street Journal first reported on the firing, citing an unspecified security issue. Another of his originals, Communications Director Hope Hicks, resigned February 28.
Mr Trump's re-election campaign manager, Brad Parscale, announced on Tuesday Mr McEntee would rejoin the 2020 effort along with Katrina Pierson, a former Trump campaign spokeswoman.
"We need the help of proven leaders such as".