If Robert Mueller requests that president Trump be interviewed for whatever reason, the president could decline without embracing the Fifth Amendment, rather saying that the entire investigation of his supposed collusion with Russia is a farce while Robert Mueller’s collaborator Hillary (the Uranium One miscreants weren’t reported to Congress while Mueller was head of the FBI) is facing extreme criminal jeopardy as their plot unravels. Their guilt is so obvious now that justice need be had, otherwise about three fourths of the nation will not trust the justice system.