(Undated)  --  Campaign officials say Republican presidential nominee Donald Trump is scheduled to visit Portland in the coming weeks.  The billionaire real-estate mogul is also slated to visit Seattle during a west-coast swing that will include Napa, California and San Francisco between August 29th and 31st.  A campaign spokesman says Trump is scheduled to hold 21 fundraisers during the month of August.  No specific dates have been set for the West Coast visits.