U.S. media reported his abrupt exit came about due to difficulties in obtaining a full security clearance.
Nauert, 48, of Locust Valley, a former Fox News host on "Fox and Friends", was promoted Tuesday after Steve Goldstein, the former undersecretary of State for public diplomacy, was sacked for breaking from the official White House position on the ousting of Secretary of State Rex Tillerson.
McEntee indicated to colleagues that there was an issue in his background that may have prevented him from gaining full security clearance and led to his dismissal, the Wall Street Journal reported on Tuesday.
While everyone in Washington was talking about Rex Tillerson, a long-time aide to Donald Trump was shown the White House door. Before McEntee's departure, 43 per cent of the president's executive staff had left in the first 13 1/2 months.
Johnny McEntee was sacked because he is now under investigation by the Department of Homeland Security for serious financial crimes, a source familiar with his firing tells CNN.
At the very least, it appears Mr McEntee did not have a permanent security clearance and, with the ongoing criminal investigation, was unlikely to every be granted one.
Pilot Who Survived NY Helicopter Crash Is From Connecticut
The helicopter crashed into the East River near Roosevelt Island, located near the Mayor of New York's official residence. News footage showed one victim being loaded into an ambulance while emergency workers gave him chest compressions.
President Trump's personal assistant was let go on Monday - escorted from the White House without being allowed to get his coat, according to reports.
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.
His exit follows another original Trump campaign aide. Hope Hicks, the director of communications, has announced she is leaving in the coming days.
Also announced Tuesday, former spokeswoman Katrina Pierson was hired by the campaign as a senior adviser.
The 2020 reelection campaign team includes newly appointed manager Brad Parscale, who ran the social media wing last time around.
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