In Afghanistan on Saturday, the chairman of the powerful Senate Foreign Relations Committee said that the United States wants Pakistan to be a real ally in combatting terrorism and that Islamabad could do some things better.

Kerry's trip to Afghanistan and later Pakistan comes as the relationship between Washington and Islamabad is frayed over the unilateral U.S. raid on Pakistani soil that killed Osama bin Laden.

In his stop in the Afghan city of Mazar-i-Sharif, Kerry also said the U.S. was committed to working with the Afghan people.