James Phillips, the doctor who criticized Trump over his motorcade ride with secret service agents to greet supporters while he was hospitalized with COVID-19, is no longer working at Walter Reed National Military Medical Center.

On Sunday night, Phillips took to Twitter to announce his final day at the hospital. “Today, I worked my final shift at Walter Reed ER. I will miss the patients and my military and civilian coworkers - they have been overwhelmingly supportive,” he tweeted.

“I’m honored to have worked there and I look forward to new opportunities. I stand by my words, and I regret nothing.”

Phillips made headlines in October when he slammed Trump for setting a bad example for Americans by choosing to be in an enclosed space with others despite his COVID-19 infection. Trump was admitted Oct. 2 and decided to take a motorcade ride with secret service agents in tow just two days later.

“Every single person... in the vehicle during that completely unnecessary presidential ‘drive-by’ just now has to be quarantined for 14 days,” the doctor wrote in a now-deleted tweet.

“They might get sick. They may die. For political theatre. Commanded by Trump to put their lives at risk for theatre. This is insanity.”

In December, sources told CBS News that Phillips’ name did not appear on the Walter Reed schedule for January rotations. At the time, officials at the hospital appeared to suggest Phillips wasn’t a full-time staffer.

Walter Reed officials revealed the hospital “provides requirements for contract positions. Schedules are determined by the contractor. There was no decision made by anyone at WRNMMC to remove Dr. Phillips from the schedule.”

Neither Phillips nor officials at Walter Reed have revealed whether the doctor left by choice, or if his removal from the schedule was an internal matter.

President Donald Trump waves from his car with masked members of the US Secret Service at Walter Reed Medical Center
President Donald Trump waves from his car with masked members of the US Secret Service at Walter Reed Medical Center AFP / Brendan Smialowski