 Russia has called the additional military assistance for Ukraine a very serious threat to their national security. As Joe Biden prepares to face a crucial news conference in Washington, two more fellow Democrats in the U.S. Congress have urged him to pull out of the presidential race. Brad Schneider and Hillary Scholten both issued statements saying it was time to pass the torch. Mr. Biden's aides insist the election contest remains close. From Washington, Gary O'Donohue.