Supporters of libertarian Republican Ron Paul shouted down former Vice President Dick Cheney at a conservative conference Thursday, in a sign of a growing foreign policy rift on the American right.

Cheney had appeared on the first day of the 2011 Conservative Political Action Conference to introduce Donald Rumsfeld, the former Bush-era defense secretary who was scheduled to receive this year’s “Defender of the Constitution Award.”

That didn’t sit well with “Team Paul,” supporters of Rep. Ron Paul who have long called for an end to the US’s foreign wars.

“Where’s bin Laden?” one heckler shouted as Cheney stood at the podium to introduce Rumsfeld.

“War criminal!” another shouted out, prompting a heated reaction from the crowd.