Rep. Darrell Issa (R-Calif.) pledged on Wednesday to investigate both Barack Obama and George W. Bush with his newfound subpoena power when he takes over as chairman of the House Oversight and Government Reform Committee. “I’m going to be investigating a president of my own party, because many of the issues we’re working on began [with] President Bush or even before, and haven’t been solved,” Issa said during an interview on MSNBC’s “The Daily Rundown.”