Nothing terrified or animated the Founders more than that. The Founders, who wrote the Constitution, had just won a war against a king who had less power than this legislation will give to the president. But to protect their freedoms, they wrote in the Constitution the now iconic guarantee of due process. The Fifth Amendment to the Constitution says, "No person shall be ... deprived of life, liberty, or property, without due process of law." Note, the Founders used the word "person." Thus, the requirement of due process must be accorded to all human beings held by the government -- not just Americans, not just nice people, but all persons. When Lincoln tried to deny this during the Civil War, the Supreme Court rejected him and held that the Constitution guarantees its protections to everyone that the government restrains, no matter the crime, no matter the charge, no matter the evidence, no matter the danger.
If this legislation becomes law, it will be dangerous for anyone to be right when the government is wrong. It will be dangerous for all of us. Just consider what any president could get away with. Who would he make disappear first? Might it be his political opponents? Might it be you?