(CNN)  United States Secret Service director Randolph “Tex” Alles is being removed from his position, multiple administration officials tell CNN.

President Donald Trump instructed his acting chief of staff, Mick Mulvaney, to fire Alles. Alles remains in his position as of now but has been asked to leave.

The USSS director was told two weeks ago there would be a transition in leadership and he was asked to stay on until there was a replacement, according to a source close to the director.

Secret Service officials have been caught by surprise with the news and are only finding out through CNN, according to the source.

A source familiar with the the director said his ouster was not related to the recent scrutiny the Secret Service got after a Chinese woman illegally entered the President’s Mar-a-Lago club carrying Chinese passports and a flash drive containing malware.  Just five days ago, Trump said he “could not be happier with Secret Service” following the Mar-a-Lago incident.  “Secret Service has done a fantastic job from Day 1. Very happy with them,” Trump said during a White House event when asked by reporters about the Mar-a-Lago trespasser.

The Secret Service director reports directly to the Secretary of Homeland Security, Kirstjen Nielsen, who resigned on Sunday amid growing pressure from the President. The director oversees the Secret Service’s work on both protection and investigations.  “There is a near-systematic purge happening at the nation’s second-largest national security agency,” one senior administration official says.

United States Citizenship and Immigration Services director Francis Cissna and Office of the General Counsel’s John Mitnick are expected to be gone soon, and the White House is eyeing others to be removed.

The President in recent weeks empowered Stephen Miller to lead the administration’s border policies “and he’s executing his plan” with what amounts to a wholesale decapitation or the Department of Homeland Security leadership, the official says.

Neither the USSS nor the White House immediately responded to CNN’s request for comment.

Alles previously served in Customs and Border Protection leadership and also led that agency’s Air and Marine Operations. He is a 35-year veteran of the Marine Corps.

CNN’s Pamela Brown, Jeremy Diamond and Allie Malloy contributed to this report.