Former President Trump threatened Illinois-based John Deere on Monday with massive tariffs on its products if it outsources some of its manufacturing to Mexico as it had previously announced, the latest indicator he would use tariffs aggressively if he wins in November. “I just noticed behind me John Deere tractors. I know a lot about John Deere, I love the company,” Trump said at an event with farmers in Pennsylvania. “But as you know, they’ve announced a few days ago that they’re going to move a lot of their manufacturing business to Mexico,” he continued. “I’m just notifying John Deere...