US shutdown: Rising tensions spark White House protest
13 October 2013 Last updated at 22:47 BST
Politicians in Washington have been warned that their failure to agree on America's debt carries serious risks for the global economy.
The head of the IMF Christine Lagarde said a default, which might happen as early as Thursday, could lead to a new worldwide recession.
Protests by members of the public have been taking place outside the White House, as tensions over the shutdown rise.
Mark Mardell reports from Washington.