.Unless I'm mistaken, there are a number of intelligence agencies working for the president.
I believe the production of false documents is a not uncommon activity of such agencies.
I'm highly agnostic on the whole subject.
I also think it is irrelevant. The Constitution allows for only one method of refusing a president from office, impeachment. There is, and should not be, any way for a lawsuit to remove him.
Of course, we the people have an opportunity to remove him this year, if we so choose.
I want him hauled away in handcuffs. And all his accomplices with him.