House Republicans launched so many oversight investigations this year that they turned to Capitol Hill veteran Rob Borden to coordinate them.

President Barack Obama’s second term opened amid controversy that triggered investigations into a number of politically sensitive issues. Among them: Lingering questions about the terrorist attack on the U.S. mission in Benghazi, Libya; accusations that the Internal Revenue Service used political criteria to target applications for tax-exempt status; the U.S. Department of Justice’s investigations into the leak of classified information.