President Trump’s campaign sued the city of Philadelphia on Thursday night, escalating a battle with city commissioners who have barred campaign representatives from overseeing the voter registration process ahead of the 2020 election. The Trump 2020 Campaign is asking the court to compel city officials to allow its representatives inside satellite offices to observe people as they register to vote or fill out mail-in ballots. City and state officials have argued there is no legal basis for campaign representatives to oversee procedures prior to Election Day. “Bad things are happening in Philadelphia,” the campaign’s lawsuit said. “While transparency and accountability...