Cite them with contempt. Make them a household name. Put them in the spotlight. Go after their license.
And then subpoena the rest.
There also aren’t a lot of people with the courage to become public pariahs famous for tossing their reputation down the toilet for a shitty public sector job that would ruin their private sector future.
Drag them out of the anonymity of an org chart and right into the cover of every paper in the country.
Then cordially invite others to come in of their own accord or walk the plank too.
“(Person X) has a duty to obey the law. They’ve chosen to break the law for a corrupt Donald J. Trump. Who is (Person X) and what are they hiding?”
Let the news trucks roll up on their lawn.
Let them scramble to find an attorney and then worry how they’ll afford it.
Let their co-workers watch what that vise looks and feel likes.
And then ask them if they’d like a squeeze too.
Let’s see how much the corrupt little weasels like becoming household names for doing the opposite of Dr. Blasey Ford: refusing to face Congress.
Expose them. Drag them out into the public square.
It would only take one.