Senate Republicans plan hearing on Biden's alleged cognitive decline cover-up

The lawmakers are still gathering witnesses for the probe, which would be the first full congressional committee hearing on the subject.

Both lawmakers contend Biden's decline was hidden for "years." 

"For this conspiracy between the mainstream media, Joe Biden's family and his inner circle to have hidden the impairment of the president of the United States for years, and lied consistently to the American people about his capacity to make decisions, which are solely vested by the Constitution, is unacceptable," Cornyn said in a statement to Fox News Digital.  

Rep. Buddy Carter, R-Ga., is leading the charge to create the panel and introduced legislation Thursday to start the committee that would dive into "the potential concealment of information from the American public" regarding Biden's health.  

And House Oversight Committee Chair James Comer, R-Ky., has called on several high-ranking staffers from the Biden White House to participate in transcribed interviews regarding their alleged roles in covering up the former president's decline. 

Comer called on Neera Tanden, the former director of the Domestic Policy Council; former assistant to the President and deputy chief of staff Annie Tomasini; former senior adviser to the first lady Anthony Bernal; former deputy director of Oval Office operations Ashley Williams; and Biden's physician, Dr. Kevin O'Connor, to participate. 

The growing fervor among Republicans to uncover whether Biden's allies and family hid concerns about his health from the public comes after the release of "Original Sin" by CNN host Jake Tapper and Axios reporter Alex Thompson. 

Their book claimed the Biden White House was trying to control the narrative about the former president's health and that his allies worked to cover up his decline.