GREELEY, Colo. (AP) — Republican vice presidential candidate Paul Ryan is criticizing President Barack Obama's suggestion of creating a secretary of business.

At a rally in Greeley on Thursday, he said there already is a commerce secretary's position but criticized Obama for leaving it vacant for four months.

Ryan appeared with his wife Janna and is scheduled to hold another rally in Montrose on Friday before heading to Iowa and Ohio.

Mitt and Ann Romney will campaign in Colorado on Saturday. They'll be joined by Randy Owen, the lead singer of Alabama, at a rally in Englewood in the evening. They'll also hold a rally at the Colorado Springs airport in the afternoon.