http://news.bbc.co.uk/2/hi/middle_east/6180623.stmTroops injection'
"The situation is very, very serious," said Mr McCain in Baghdad, where a high-level Congressional delegation has been holding talks with US commanders and Iraqi officials.
Republic Senator John McCain in Baghdad on 14 December 2006
Mr McCain said Shia cleric Moqtada al-Sadr should be dealt with
"It requires an injection of additional troops to control the situation and to allow the political process to proceed," he said.
He suggested that reinforcements could be five to 10 brigades - about 15,000 to 30,000 troops - to deal with the situation.
Mr McCain also urged both the Iraqi government of Prime Minister Nouri Maliki and the US-led coalition to do more to break the influence of radical Shia cleric Moqtada al-Sadr and his Mahdi Army.
"We should have arrested Moqtada al-Sadr three years ago. He continues to be a major obstacle to peace - his influence in domestic politics needs to be eliminated," he said.