On November 3, 2002 the CIA exercised this power by firing a "Hellfire" missile that killed a carload of "suspected" (not convicted) al-Qaida operatives in Yemen. One of those individuals happened to be an American citizen (Kamal Derwish). American authorities allege he was the leader of an al-Qaida cell in Buffalo, N.Y., although he was never charged with a crime. Well I guess that's all the proof flag waving Americans need, surely the "authorities" wouldn't lie.

Associated Press - December 3, 2002
'The Bush administration said the killing of an American in this fashion was legal.'
"I can assure you that no constitutional questions are raised here. There are authorities that the president can give to officials,'' said Condoleezza Rice, Bush's national security adviser, after the attack. ''He's well within the balance of accepted practice and the letter of his constitutional authority.'' In killing him, the administration defined Derwish as an enemy combatant, the equivalent of a U.S. citizen who fights with the enemy on a battlefield, officials said. Under this legal definition, experts say, his constitutional rights are nullified and he can be killed outright.'

The United States Declaration of Independence
'We hold these truths to be self-evident, that all men are created equal, that they are endowed by their Creator with certain unalienable Rights, that among these are Life, Liberty, and the pursuit of Happiness. That to secure these rights, Governments are instituted among Men, ... That whenever any Form of Government becomes destructive of these ends, it is the Right of the People to alter or to abolish it.'