Their discussion focused on fighting terrorism and "the importance of cooperating toward a peaceful and stable outcome in Afghanistan", the White House said in a statement. 

"The President underscored the importance of the US-Pakistan relationship and our continued support for Pakistan", it said. 

Zardari is in Washington to attend a memorial service for diplomat Richard Holbrooke, who was Obama's envoy in Pakistan and Afghanistan. Holbrooke died last month. 

US Vice President Joe Biden huddled with Zardari on January 12 in Islamabad during his unannounced visit to the region. Biden also met with PM Yousuf Raza Gilani and senior military officials.