House Republicans are issuing a subpoena to former President Biden's personal physician Kevin O'Connor as part of their investigation into the ex-president's health.

Why it matters: House Oversight Committee chair James Comer (R-Ky.) is ramping up the probe after new revelations emerged about Biden's cognitive decline in Alex Thompson and Jake Tapper's new book, "Original Sin." • In addition to O'Connor, Comer has requested testimony from nine of Biden's former aides including Neera Tanden, Anita Dunn and Ron Klain.

Driving the news: In a letter to O'Connor accompanying the subpoena, Comer wrote that the Biden doctor is compelled to appear at a deposition on June 27. • Comer wrote that he is investigating whether O'Connor "contributed to an effort to hide former President Biden's fit

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