Joe Biden's White House physician faced mounting calls to testify under oath on Monday for giving the ailing President a clean bill of health just months before he was diagnosed with late-stage prostate cancer.

Biden's startling revelation on Sunday that he was battling a severe form of cancer that metastasized to his bones sparked bipartisan well wishes and support.

But just 24 hours later, knives were out as MAGA cynics demanded transparency over the former president's health.

His longterm physician Kevin O'Connor repeatedly assured the American public during Biden's term that he was healthy and could have served another four years.

Experts, however, have questioned why Biden's prostate cancer was not picked up earlier given the late stage prognosis. The discrepancy has sparked theories that Jill Biden, O'Connor and other political allies may have covered up the diagnosis.