House Republicans are investigating Michael Atkinson, the Intelligence Community inspector general who notified Congress of the whistleblower complaint that sparked an impeachment effort against President Trump.

California Rep. Devin Nunes, the ranking member on the House Intelligence Committee, told The Sara Carter Show on Monday that Atkinson still faces “serious questions” after his testimony in October, which to this day remains under wraps. Democrats have not released the transcript of that deposition despite mounting pressure by Republicans.