US Senate Armed Services Committee Chairman John McCain has kicked protesters out of a committee hearing, calling them "low-life scum" as they shouted for the arrest of one of the witnesses, former secretary of state Henry Kissinger. Shortly after Kissinger, 91, took a seat at the witness table, several protesters from the anti-war group Code Pink approached from behind, waving signs and a pair of handcuffs, and chanting, "Arrest Henry Kissinger for war crimes." McCain responded from the podium: "You know, you're going to have to shut up or I'm going to have you arrested," calling for US Capitol Police to remove them. As officers escorted the protesters out of the hearing room, the unsuccessful 2008 Republican presidential candidate, a decorated Vietnam veteran and prisoner of war, growled: "Get out of here, you low-life scum." US Capitol Police Sergeant Kimberly Schneider said three people were removed from the room, but no arrests were made. In a statement later, McCain noted a gap between the beginning of the protest and the arrival of officers. "With no US Capitol Police intervening, the episode went on for several minutes," McCain said. He added he had spoken with police and expects "those responsible will be held fully accountable for their actions." The upheaval came Thursday during a committee hearing about global security challenges facing the US that also featured testimony from fellow former secretaries of state Madeleine Albright and George P. Shultz, who were sitting at the witness table with Kissinger. Code Pink protesters routinely interrupt congressional hearings and are ushered out by police. But Thursday's incident was different, McCain said, because the protesters came within inches of Kissinger and waved what appeared to be metal handcuffs near his head.