Several federal agencies are accelerating hiring in the final days of the Obama administration to ensure that as many new employees as possible are in place before President-elect Donald Trump imposes a promised hiring freeze. Leaders at these agencies are filling open positions with transfers and outside hires and are making internal promotions before Trump takes office Jan. 20, according to internal documents and interviews. The hiring could increase tensions between the Trump transition team and the Obama administration — a relationship that has grown worse in recent days due to disagreements over how the United States should handle its...