The world is getting more uptight about lending money to President Donald Trump’s government — causing interest rates to climb in ways that are worsening affordability pressures, hampering economic growth and creating a new risk for Republicans in November’s midterm elections. The energy price spike triggered by the Iran war has seeped into the price of bonds that help fund the U.S. government. Interest rates on a 10-year U.S. Treasury note are topping 4.44%, up from 3.95% before the war started at the end of February. Average mortgage rates have climbed to their highest levels in nine months, while auto...