U.S. Vice President Joseph Biden, left, Hamid Karzai, Afghan

UNITED STATES - MAY 06: U.S. Vice President Joseph Biden, left, Hamid Karzai, Afghanistan's president, second from left, and Asif Ali Zardari, Pakistan's president, right, listen to President Barack Obama speak in the Cross Hall of the White House in Washington, D.C., U.S., on Wednesday, May 6, 2009. Obama said the security of both countries and the U.S. is linked by the fight against extremists. (Photo by Brendan Smialowski/Bloomberg via Getty Images)