The response comes amid a media report suggesting that the Trump administration is exploring the option of withdrawal of troops from Afghanistan.
"We're contributing to a process that's being led by the White House that is looking across our instruments of national power, not just military, but diplomatic, financial, intelligence and information as well to lay out what our desired end state is," the Pentagon Press Secretary, Navy Captain Jeff Davis told reporters during an off-camera news conference at the Pentagon yesterday.
Top leaders in the past have said that they are adopting a regional approach in finding a permanent solution to the decades old Afghan crisis. This includes India, Pakistan, China, Central Asian Republics and Russia.
The White House has already authorised Defence Secretary Jim Mattis on increasing the number of troops in Afghanistan by a few thousands, he said, adding that Mattis would not take such a call unless the strategy is in place.
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Mattis, he said, "wants to get the strategy right first," before committing to increase in troops or drawdown.
"More than six months after President Trump's inauguration, there still is no strategy for success in Afghanistan. Eight years of a 'don't lose' strategy has cost us lives and treasure in Afghanistan. Our troops deserve better," said McCain, who is chairman of the powerful Senate Armed Services Committee.
"When the Senate takes up the National Defence Authorisation Act in September, I will offer an amendment based on the advice of some our best military leaders that will provide a strategy for success in achieving America's national interests in Afghanistan," McCain said.
"Unable to agree on a plan to send up to 3,900 more American forces to help turn back Taliban advances in Afghanistan, the White House is taking a new look at what would happen if the US decided to scale back its military presence instead," the daily quoted some current and former officials of the Trump administration as saying.
According to the daily, a senior administration official said: "It's a macro question as to whether the US, this administration, and the president are committed to staying."
The US state department had said last week that a military strategy may not "necessarily" yield results in Afghanistan and a permanent solution to the conflict can be found through peace talks with the Taliban and other parties involved.
Afghanistan has been battling insurgency for more than a decade. The Taliban offensive against the West-backed government in the country increased this summer. Much recently, a Taliban suicide bombing killed at least 26 people in Kabul.