A leading skeptic of U.S. intervention in conflicts abroad said Sunday that he believes there is only a “50/50” chance that the GOP-controlled House will vote to authorize the use of U.S military force in the Syria.

“I think it’s at least 50/50 whether the House will vote down involvement in the Syrian war,” Sen. Rand Paul of Kentucky said on NBC’s Meet the Press.

“I think the Senate will rubber stamp what [Obama] wants but I think the House will be a much closer vote,” he added. “And there are a lot of questions we have to ask.”

Paul, a staunch defender of civil liberties who has battled against members of his own party over the government’s use of drones and NSA data collection programs, said he believes it’s a “mistake” to get involved in a civil war in Syria that could escalate “out of control.”