US President Donald Trump on Monday said that a Minnesota company plans to build a multibillion-dollar steel mill in Iowa, handing the administration a marquee manufacturing investment to showcase as Republicans head into November’s midterm elections. Trump unveiled the project at the White House with executives from Mesabi Metallics, which recently opened Minnesota’s first new iron ore mine in 50 years. A White House official said the plant investment would amount to US$15 billion. The...