Former aide set to testify in GOP probe about Biden’s mental fitness for office

Another senior aide to former President Joe Biden is set to testify Thursday before the House Oversight Committee as part of the GOP-led panel’s investigation into what it charges was a “cover-up” of Biden’s mental decline.

​ Another senior aide to former President Joe Biden is set to testify Thursday before the House Oversight Committee as part of the GOP-led panel’s investigation into what it charges was a “cover-up” of Biden’s mental decline. Read More Breaking News, Latest News and Videos | CNN