"Can't ever". Not sure about that. There are many ways to get rid of @Jack. Pretty sure POTUS can think of many more than I can.
MD Anderson Cancer Center ousts three scientists suspected by feds of working with China to steal research
"The three, in internal documents the MD Anderson Cancer Center provided to the Houston Chronicle, were identified as ethnically Chinese. Two of them resigned ahead of termination proceedings and the third is now challenging the dismissal. Officials determined termination was not warranted for one and the last is still under investigation.
The documents, according to the New York Times, allege the National Institutes of Health complained to the facility last year about one of the scientists sending a grant application to a counterpart in China, while it is suspected others held undisclosed positions at medical institutions in Beijing.
“A small but significant number of individuals are working with government sponsorship to exfiltrate intellectual property that has been created with the support of U.S. taxpayers, private donors and industry collaborators,” the center’s president, Dr. Peter Pisters, told the newspaper after news of the ousters emerged."
https://www.foxnews.com/us/cancer-scientists-accused-of-stealing-research-for-china