An Act of Congress limiting the president's power to strike Americans won't prevent people like John Yoo from claiming that the president can flout the law, but it will leave no doubt that the president is acting illegally if they do so.
At least one Democratic senator is already planning to oppose Dr. Vivek Murthy, President Obama's Surgeon General nominee, over his gun violence prevention stance. The gun lobby has been actively pushing the Senate to reject Murthy's nomination.
Three decades after his own presidential race, Barry Goldwater himself understood that the views he once championed were wrong. And Tea Party conservatives would foist these views upon the nation regardless.