Pakistan wants to persuade the United States to stop using drones, he said.
"International opinion is against drone strikes, not just here in Pakistan, but in the world," Chaudhry said. "This opinion is strengthening."
Adding to the pressure, Human Rights Watch also released a report on U.S. drone attacks Tuesday -- this one focusing on Yemen.
Letta Taylor, a senior counterterrorism researcher for Human Rights Watch, said the group found at least two clear cases of violations of international laws of war, but those did not reach war crimes status.
The group said four of the six attacks it had investigated "may have violated the laws of war."
Lack of U.S. disclosure
Based on extensive field research, the reports underlined the difficulties of gathering information on attacks in dangerous areas of Pakistan and Yemen.
"We found that despite assurances from President Obama that (the U.S. government is) doing its utmost to protect civilians from harm, that in fact in many cases it is killing innocent civilians, even dozens of them, if not more," Taylor said.
And both reports noted the U.S. government's unwillingness to talk about the cases.
The lack of information from U.S. authorities, Amnesty said, makes it impossible "to reach firm conclusions about the context in which the U.S. drone attacks on Mamana Bibi and on the 18 laborers took place, and therefore their status under international law."
White House Press Secretary Jay Carney rejected the idea that the United States has violated any laws.
"To the extent these reports claim that the U.S. has acted contrary to international law we would strongly disagree," he said at a press briefing Tuesday. "The administration has repeatedly emphasized the extraordinary care that we take to make sure that counterterrorism actions are in accordance with all applicable law."
The U.S. government has said strikes by the unmanned aircraft are a necessary part of the fight against militant groups. In May, Obama defended the drone program and disclosed the guidelines determining its use.
He said drones would be deployed only when there is an imminent threat, no hope of capturing the targeted terrorist, "near certainty" that civilians wouldn't be harmed and "no other governments capable of effectively addressing the threat."
Civilian victims in Yemen
But Human Rights Watch said the evidence it had gathered "strongly suggests" that the strikes in Yemen it documented "did not adhere" to the policies set out by Obama.
The group said the attacks its report covers took place between 2009 and 2013, killing 82 people, at least 57 of them civilians.
The strikes ostensibly targeted suspected members of al Qaeda in the Arabian Peninsula (AQAP), but victims included women, children, truck drivers and other civilians, the report said.
"At least four of the strikes were carried out by drones, a fifth strike by either drones or warplanes, and a sixth one by cruise missiles releasing cluster munitions, indiscriminate weapons that pose unacceptable dangers to civilians," it said.
The report also questioned the military validity of several of the suspected al Qaeda operatives targeted.
Fear and polarization
Both reports describe the climate of fear created by the drones in Pakistan and Yemen, and the polarizing effect the attacks are having on local populations.
"The ultimate tragedy is that the drone aircraft the USA deploys over Pakistan now instill the same kind of fear in the people of the Tribal Areas that was once associated only with al Qaeda and the Taliban," said the Amnesty report.
"Like other forces operating in the Tribal Areas, the USA appears to be exploiting the lawless and remote nature of the region to evade accountability for its violations," it said.
Human Rights Watch described a similar situation in Yemen.