Washington, March 27 : The United States President Barack Obama, while unveiling his new Pak-Afghan strategy on Friday, has said that Pakistan must demonstrate its commitment to root out Al-Qaida.

"We cannot and we will not give a blank cheque to Pakistan," said Obama, adding: "extremists are a cancer that is killing Pakistan from within"

"We will pursue constructive diplomacy with both India and Pakistan," Obama added.

The US President has proposed 1.5 billion dollars in aid to Pakistan (ANI)