text:  Trump's running mate, Senator J.D. Vance of Ohio, addressed growing uncertainty about President Biden. It is not public spiritedness to call for him to step down when he's about to lose an election. They should have been doing it years ago. Vance on Fox News Channel's Hannity. Amid concerns about his mental acuity, Biden staying the course as he faces growing calls from allies to make way for another Democratic nominee.