US Secretary of State Rex Tillerson on Sunday demanded that Iranian "militias" leave Iraq at a press conference in Riyadh, where the US diplomat is holding talks with top Gulf officials. 

"Certainly Iranian militias that are in Iraq, now that the fighting against (the Islamic State group) is coming to a close, those militias need to go home," Tillerson said at a press conference in Riyadh. 

"All foreign fighters need to go home."