John Nicholson ? a US Army General and the commander of the US forces in Afghanistan ? speaks during a joint press conference in Kabul, Afghanistan, November 20, 2017. AFP/Shah Marai/Files

WASHINGTON: The top US general in Afghanistan said on Tuesday that he had not seen a change in Pakistan?s support for militants so far, despite President Donald Trump taking a tougher line against Islamabad.

US officials have long been frustrated by what they see as Pakistan?s reluctance to act against groups such as the Afghan Taliban and the Haqqani network, which launch attacks on neighbouring Afghanistan.

In August, Trump outlined a new strategy for the war in Afghanistan, chastising Pakistan over its alleged support for Afghan militants.

He accused Pakistan of harbouring ?agents of chaos? and providing safe havens to militant groups waging an insurgency against a US-backed government in Kabul.

Pakistan's military, however, had brushed off the speculation that Trump could signal a stronger line against Islamabad, insisting the country has done all it can to tackle militancy.

"Let it come," Major General Asif Ghafoor ? the Pakistani military spokesman ? had told reporters. "Even if it comes... Pakistan shall do whatever is best in the national interest."

The US official expressed hope that relations between the two countries could improve after a kidnapped US-Canadian couple and their three children were freed in Pakistan in October after the couple was abducted in neighbouring Afghanistan.

?We have been very direct and very clear with the Pakistanis... we have not seen those changes implemented yet,? General John Nicholson told reporters.

?We are hoping to see those changes, we are hoping to work together with the Pakistanis going forward to eliminate terrorists who are crossing? the border, Nicholson said.

He added that he believed that senior Taliban leaders were based in Pakistan, while the lower level leadership was in Afghanistan.

Pakistan says it has done a great deal to help the United States in tracking down terrorists.