PHILADELPHIA (AP) — The University of Pennsylvania says Arlen Specter, who wrapped up 30 years as a U.S. senator, will teach at its law school this fall on the relationship between Congress and the U.S. Supreme Court.Specter, who was Pennsylvania's longest serving senator, was defeated in last year's Democratic primary by then-U.S. Rep. Joe Sestak, who ultimately lost to Republican Pat Toomey.The school said Tuesday that Specter's course will focus on the separation of powers and the Supreme Court confirmation process, something he was involved with as a member of the Senate Judiciary Committee from 1981 until 2010, including as chairman from 2005-2007.Specter graduated from Penn and earned a law degree at Yale University. He began his long stretch of public service as an assistant city district attorney in Philadelphia in 1959.