CBS Evening News with Norah O'Donnell, 08/23/23

100 million Americans under warnings. We'll tell you which areas are getting the worst of it and severe drought is threatening the Panama Canal and why it could impact the cost of goods here. A mystery unfolding in Russia, after a private jet crashed nearly 200 miles north of Moscow. Believed to be on board, Russian mercenary leader Yevgeny Prigozhin, and his number two, the commander of the Wagner group. President Biden tonight on whether this was Putin's payback.