The attack has raised concerns in Pakistan about the United States' increased willingness to take unilateral action in the war on terror.
Islamic militants claim to be targeting Indian cities to stoke communal tensions.
Prime minister Gilani arrives at the White House Monday. Likely topics: counterterrorism and democratic stability.
Rising prices and a falling stock market have sparked protests in recent weeks, increasing the pressure on a government already facing militancy, political discord.
The heightened political tensions between the two allies in the war on terror has prompted US presidential hopefuls to focus on improving Afghanistan strategy.
They seem to be moving from Iraq to Pakistan and Afghanistan.