To go *real* dark for a moment, before leaving office, President Trump could authorize the creation of a “black” department, perhaps in the CIA, whose sole purpose would be to discover Chinese infiltration in the US government and critical industries, and “accident” them.
That is, with more than plausible deniability, they would be killed in orchestrated accidents. Such sanctions would apply to both Chinese and Americans working with them.
By longstanding policy, the United States does not assassinate “foreign leaders”, but that is the only constraint we put on ourselves. So ordinary spies and their conspirators are open season.
Trouble with that is the “black operations” would be stumbling all over one another as they are plentiful and active now AND not helping us or THE US. We can’t count on the CIA to help us peons in any way...
We’re all going to have horrific headaches rearranging our thinking from what we previously believed about agencies of the government having “the people” in mind...