U.S. Senate Minority Leader Mitch McConnell (R-KY) is shown in this C-Span video footage as he addresses the Senate during an unusual session on Capitol Hill in Washington, December 30, 2012. The chances of a deal to prevent the U.S. economy from tumbling over a "fiscal cliff" remained uncertain on Sunday as lawmakers haggled over how to prevent taxes for all Americans from rising on New Year's Day. REUTERS/C-SPAN/Handout