Ron Paul says Al-Awlaki killing could be impeachable

Republican presidential candidate Ron Paul ramped up his criticism of the Obama administration over the killing of Al-Awlaki, an American citizen with connections to terrorist groups, saying that Obama could be impeached over the attack.

Politico reports that at a campaign event in Manchester, N.H., Monday, Paul said that impeachment was "possible" and that the act of killing an American citizen without due process was a step toward "tyranny."

"I put responsibility on the president because this is obviously a step in the wrong direction," Paul said, according to Politico's Dan Hirschhorn. "We have just totally disrespected the Constitution."

Paul, a libertarian congressman from Texas, has been the only Republican presidential candidate to criticize the effort. When first asked about the assassination last week, Paul called the operation "sad."

"He was born here," Paul said. "He is an American citizen. He was never tried or charged with any crime. Nobody knows if he killed anyone."

Earlier this year, Paul said that sending U.S. forces to Libya was "an impeachable offense" as well.