The only branch of the Federal Government with the power and authority to remove a sitting President for crimes, per the U.S.Constitution, is the legislative branch - Congress.
The power and authority to remove a usurper via Quo warranto was delegated, by Congress, to the District Court, Washington, D.C.
“.....The power and authority to remove a usurper via Quo warranto was delegated, by Congress, to the District Court, Washington, D.C.......”
Anybody try a quo warranto method yet?