CEDAR RAPIDS — Rep. Rod Blum, who two years ago called on northeast Iowans to elect Donald Trump and send him back to the U.S. House, is doubling down on his support for the Republican president.Blum will host Trump in Dubuque on Thursday. Sunday, after Politico.com broke the news that the president would visit the Mississippi River city, Blum posted on Twitter:“Looking forward to hosting @POTUS @realDonaldTrump in my hometown @cityofdubuque for a round table.