(Portland, OR)  --  A man is facing charges after allegedly attacking another man with a hatchet downtown.  Police say 35-year-old Nathan Schrader was at the Standard Insurance Center yesterday morning when an employee asked him to leave for trespassing.  Schrader allegedly left and then returned with a hatchet, hitting the employee over the head with the blunt end of the weapon.  Police say the victim did not require any medical treatment.  Police tracked Schrader down a few blocks away and arrested him.