A quick executive order making it illegal for a foreign agent to serve would cut out those on list and some of the rats. Even things out.
With an honorable people guidelines and restrictions like that wouldn't be required.
Sad to say that is not America today.
The problem is that most federal politicians are either corrupt from the get-go or are soon corrupted after taking office.
Those that won't play the dirty game are isolated and attacked by the political mafia (aka Deep State)
What president Trump has had to endure the last four years is an example of what happens to the rare honorable office holder
who can't be bought, blackmailed or corrupted in other ways.