President Trump is slated to hold a campaign rally in Pennsylvania next month as he seeks to keep the Keystone State in his column in next year's election. The event is set to take place on Dec. 10 at the Giant Center in Hershey, Pa., the Trump campaign announced Thursday. The center contains 10,500 seats. “Pennsylvania is booming thanks to President Trump and jobs are coming back to the state,” Michael Glassner, the Trump campaign’s chief operating officer, said in a statement. “President Trump is delivering on his promises, and he looks forward to celebrating those successes with the great...