President Biden holds summit for democracy amid tensions with Russia
President Joe Biden invited more than 100 countries to participate in a two-day virtual summit for democracy that starts Thursday. The event follows the president's high-stakes call with Russian President Vladimir Putin earlier this week, which he is expected to discuss with Ukrainian President Volodymyr Zelensky and NATO leaders. CBS News correspondent Christina Ruffini joins "CBSN AM" to break down the latest.