WASHINGTON - On Joe Biden’s big day, President Donald Trump is planning to show up in his rival's old backyard.Trump, in what can only be described as a piece of campaign trolling, on Thursday afternoon was staging an event just outside the former vice president’s birthplace in Scranton, Pennsylvania, mere hours before Biden formally accepts the Democratic nomination for president.The political tradition of a presidential candidate lying low during the other party’s convention has eroded over the decades but — to the private delight of Trump’s advisers — the president's trip looked to be a particularly in-your-face piece of counter-programming designed to rattle an opponent.RELATED: Former Trump adviser Steve Bannon, 3 others, indicted for.