McEntee was reportedly escorted out of the White House after his firing on Tuesday and was not even given time to collect his personal belongings, including his jacket.
The Secret Service investigates a range of crimes, including credit card fraud, counterfeiting, financially oriented cybercrimes and child pornography, as well as threats.
"We do not comment on personnel issues", White House press secretary Sarah Sanders told CNN.
Axios's Jonathan Swan touched on how devastating this will be for morale inside the White House. He was one of a shrinking group of campaign aides still working in the turbulent West Wing.
Drew Mahowald: The Vikings and their Chances of Landing Drew Brees
Strief thanked the organization for taking a chance on him, adding that he was humbled to play alongside quarterback Drew Brees. But it's also possible that some team will blow Brees away with an offer that dwarfs what the Saints are willing to pay.
His exit comes two weeks after White House communications director Hope Hicks, also a long-serving staffer, stepped down.
January 30, 2017: Trump fired the acting attorney general, who was appointed by Obama, after she directed the Justice Department not to defend the president's first travel ban on citizens from seven Muslim-majority countries.
Though McEntee traveled alongside Trump, his profile was relatively low compared to other aides with similar tenure, like senior adviser Stephen Miller or the White House's director of social media Dan Scavino. The role meant McEntee was almost constantly at the President's side.
Japan PM wife's name removed from documents in suspected cronyism scandal
Akie Abe was the honorary principal of the envisioned school but stepped down after the land sale drew public attention. The risk for Aso and Abe, experts said, is that the suspected cover-up does more damage than the land sale itself.
His firing marks yet another departure in an executive office marked by a revolving door of hirings and firings and plagued by issues obtaining security clearances. And it highlights the extent to which the re-election campaign has already become a landing pad for former Trump associates who have left the White House but remain loyal to the President.
"We need the help of proven leaders such as John to promote the President's growing portfolio of achievements across the country".
His swift departure comes amid a series of security clearance issues in the White House.
Southampton have sacked their manager
Pellegrino's assistant Carlos Compagnucci and assistant first team Coach Xavier Tamarit will also leave the club with immediate effect.
- Frozen Eggs and Embryos No Longer Viable After Hospital Mishap?
- Serena wins again, sets up sisters match
- At least 50 dead after plane crash lands at Kathmandu
- Analyst Recommendations Watch: QTS Realty Trust, Inc. (QTS), Laredo Petroleum, Inc. (LPI)
- CSA distance themselves from SBW masks
- USA has not heard back from NK about summit: Tillerson
- Fernandinho promises no let-up in Manchester City title quest
- Rob Ford: brother of late Toronto mayor is new Progressive Conservative leader
- Honor 7C with Dual Rear Camera, Android Oreo Launched at $142
- Betsy DeVos pushes back against criticism over "60 Minutes" interview