No American president has ever drawn red lines for Tehran and enforced them by showing that transgressions are swiftly and severely punished. Jimmy Carter sat by idly when Ayatollah Khomeini and the founders of the Islamic Republic stormed the U.S. embassy and held Americans hostage for 444 days. Ronald Reagan provided the Iranians with arms – after the Islamic Republic’s Lebanese asset, Hizbullah, killed 241 U.S. Marines in the 1983 bombing of their barracks at the Beirut airport. When the FBI said Tehran was responsible for the 1996 bombing of Khobar Towers, Bill Clinton failed to respond or even name Iran.
If you can kill Americans without any consequences, you can certainly build a nuclear weapons facility without too much concern that the Americans are really keeping „all options on the table“; the White House is not and almost surely never will – no matter who’s calling the shots.