Your friend should contact his insurance agent to determine if his insurance policy will cover you. You may be required to obtain a valid U.S. license in order to be covered. However, since you will be using the vehicle on a temporary basis you many not have to. This may also depend on whether or not you reside in the same household as your friend. In any event, your friend will remain liable for any accident since he is the owner of the vehicle.

Your friend can also check out rates for his car insurance.