Trump asked Erdogan for immediate ceasefire: Pence
Pence also said he would travel to the region soon to try to mediate the crisis.
Pence said Trump had been firm with Erdogan on the phone.
Turkey launched a cross-border operation into northern Syria on Wednesday just days after Erdogan told Trump in a phone call that he planned to move ahead with a long-planned move against America's Kurdish allies in the region.
Trump abruptly announced a redeployment of 50 American troops from the conflict zone to get them out of harm's way, dismissing criticism that this would leave the Kurds open to attack. This was widely seen as giving Erdogan a green light for his operation.
U.S. Treasury Secretary Steven Mnuchin, who joined Pence, said the Treasury Department was taking economic action against Turkish ministries and senior Turkish government officials in response to the country's military operations in Syria.
