Trump scrambles to reverse Rust Belt slide

His campaign is moving to shore up his standing in Michigan, Wisconsin and Pennsylvania — where its own polling shows him trailing Joe Biden.

Donald Trump’s aides and allies are moving aggressively to shore up his support in three Rust Belt states that propelled him to the presidency — but where his own polling shows him in trouble heading into 2020.

Trump will travel to Pennsylvania Monday for a rally that comes after recent visits to Wisconsin and Michigan, two other states at the center of his reelection strategy. Those...