Sen. Lindsey Graham (R-SC) on Sunday said that President Donald Trump should release his tax returns but defended the president's court battle to keep his financial information private. Graham made the remarks during an interview on the CBS News program Face the Nation. "This is the first impeachment trial being driven by partisan politicians," Graham complained, "conducted behind closed doors, the testimony was selectively leaked, the president was denied the ability to participate in the House hearing and I want to end it.