The criminal trial of U.S. Rep. Chaka Fattah focused Tuesday on the problems of his son. A top Drexel University lobbyist, Brian T. Keech, testified about the tuition and academic woes of Chaka "Chip" Fattah Jr. that three times prompted Drexel to put him on a payment plan. The younger Fattah repeatedly stopped paying his college bills, and federal prosecutors allege that his father solved the problem by stealing from his campaign fund to pay Drexel.