 In the news center, I'm Tyler Kha. President Biden is answering back at critics after his poor debate performance two weeks ago, raising concerns about his mental acuity. In a sit-down interview with ABC News, the president called his performance on the debate stage, quote, a bad episode, but would not commit to taking an independent cognitive test. South Carolina Republican Senator Lindsey Graham joined CBS's Face the Nation, and he would like to see both President Biden and former President Trump take that cognitive test. All nominees for president going to the future,