LESTER HOLT: No criminal charges, but at the same time, little to celebrate for President Biden today, after a special counsel investigation found he willfully retained and disclosed classified materials after leaving the vice presidency. A scathing report centered on documents, some classified as top secret, found in Mr. Biden's home and former office that special counsel Robert Hur said presents serious risk to national security but raising serious questions about the president's recall, saying his memory was significantly limited in interviews with investigators. Tonight the president says he cooperated completely, threw up no roadblocks, and sought no delays. The special counsel, meantime, drawing a sharp distinction between the president's document troubles and the criminal documents case pending against former President Trump. The controversy providing another split screen moment in the race for president on the day the Supreme Court heard oral arguments over whether Donald Trump belongs on the Colorado ballot.