"The way the United States has treated Pakistan as a doormat is not fair", he said. "I don't think we are going to get stability and security in Afghanistan if Pakistan does not contribute positively to that", Envoy Juster said, in his inaugural policy speech on US-India relations here.
Khan heads the Pakistan Tehreek-e-Insaf (PTI) party that has emerged as a major national political force in recent years.
Chairman Imran Khan said on Saturday that meeting US President Donald Trump would be a "bitter pill" to swallow should he become the prime minister in elections later this year, but added, "I would meet him".
In the weeks since the Trump administration withheld almost $1 billion in security aid for Pakistan, Washington and Islamabad officials have been working to patch things up and avert a risky deterioration in their often troubled relationship.
The opposition leader has always been critical of Pakistan's participation in the USA -led war against terrorism in neighboring Afghanistan.
The stakes are raised even higher now because not only is a repeat of this scenario being contemplated, but Pakistan announced that over 1,5 million Afghan refugees have 30 days to leave the country after their legal presence there ended at the beginning of 2018, and Kabul will probably be thrown even deeper into crisis if it's suddenly forced to provide for a roughly 4% spike in its population.
"Pakistan is also important to situation in Afghanistan".
"Pakistan had nothing to do with it", he said, adding that he supported co-operation with the United States but not co-opting Pakistan's military into a ground battle with its own people in the tribal regions that border Afghanistan and where Afghan insurgents hide.
General Qamar Javed Bajwa told U.S. Central Command chief General Joseph Votel that Islamabad expects "honorable recognition of our contributions, sacrifices, and unwavering resolve in the fight against terrorism".
Pakistan's army chief on January 12 told a top USA general that the "entire Pakistani nation felt betrayed over US recent statements despite decades of cooperation".
Khan said Trump was using Pakistan as a scapegoat for the USA -led coalition's inability to defeat the Taliban and that his comments were "very insulting". While he praises liberals outside Pakistan as anti-war and committed to humanitarian values and freedom of speech, he rails against Pakistani liberals, chastising them for supporting the military operations in the tribal regions.
Khan and his party spearheaded street protests and a subsequent legal battle that ousted Pakistan's thrice-elected prime minister, Nawaz Sharif, from office last July on corruption charges.