Can you accept dirt from a foreign government? Yes.
Can you pressure a foreign govt for that dirt? Yes.
Can that foreign govt be corrupt therefore raising questions about said dirt? Yes.
Can you accept dirt from authoritarian govts?
Can that dirt be stolen or hacked by those govts?
Who is to vet the dirt, if anyone, to assess whether it’s credible?
Stolen Podesta emails?
I’ve had fringe Trump supporters make that argument re 2016 to me already. Now, it’s being repeated by one of the president’s lawyers on the floor of the US senate.