President Trump arrives at Reagan Washington National Airport. Alex Brandon/AP hide caption toggle caption Alex Brandon/AP President Trump is heading on Tuesday to Iowa, where he’s looking to change the subject to his economic agenda as his administration faces growing backlash over his immigration crackdown in Minnesota. More Republicans are calling for an investigation after a second U.S. citizen was shot by a federal agent in Minneapolis. The president is expected to tour a local business and give a speech on energy and the economy. His chief of staff, Susie Wiles, says the trip is the beginning of what will eventually be weekly travel across the U.S. in support of Republican candidates ahead of the midterm elections. But Trump is unlikely to escape the controversy surrounding his administration’s immigration tactics in Minneapolis. “The primary news story at the moment isn’t just the ICE-related shooting. It’s the response to the ICE-related shooting,” said Ryan Williams, a veteran Republican strategist who helped lead Mitt Romney’s presidential campaign. “That’s what’s going to be the focus. And the president …