The United States - under Republican George W. Bush's presidency - and its allies invaded Afghanistan on October 7, 2001 as part of Washington's so-called war on terror.
"We can not allow Afghanistan to once again become a launching point for attacks on our homeland or on our allies", he said, alluding to the former Taliban government's granting haven to Al-Qaeda before the September 11, 2011 terror attacks in the US. More than 2,300 Americans have been killed so far and 17,000 more wounded. He said that while counterterrorism efforts in Afghanistan are making progress in weakening al-Qaida and IS, "their defeat will come about only by giving our men and women on the ground the support and the authorities they need to win".
A day earlier, Mattis told the Senate Appropriations Subcommittee on Defence that the United States is considering issues from India, Pakistan and other nations in the region as part of its Afghan review.
There are about 8,400 US troops in Afghanistan now in addition to several thousand troops from allied countries.
"This decision is part of a broader strategy we are developing that addresses our role in Afghanistan and beyond".
McCain said the U.S.is "not winning" in Afghanistan, and Mattis agreed.
The announcement could be made to the public "as early as next week", according to the AP.
Prime Minister Theresa May vows to stay after Conservatives lose majority
Speaking after the result, Mr White congratulated Julie Cooper on her win saying it has been a "clean and fairly fought campaign". In the polls, the Scottish National Party won 35 seats, the Liberal Democrats 12 and the Democratic Unionist Party got 10.
The finality of the decision isn't entirely clear.
The Pentagon is reviewing the strategy for Afghanistan, which Mattis said may take several weeks. Regional powers Iran, India and China, which all have political stakes in the fate of Afghanistan, also must be considered.
Mattis signaled his intention to brief lawmakers on a new strategy by mid-July. Despite heavy losses, the Taliban fought on. He said he expects to outline a strategy for Congress within a month.
"Reconciliation" with the Taliban remains the goal, Mattis said."We're not looking at a purely military strategy", he said.
"I assure you this is not a carte blanche for me", Mattis said in testimony to the House Appropriations defense subcommittee, wrapping up a weeklong series of hearings for him and Joint Chiefs Chairman Gen. Joseph Dunford on Trump's proposed fiscal 2018 Defense Department budget.
An Afterthought: Let's suppose for a moment that Trump actually wanted to end the Afghan war.
Thanks to the vigilance and skill of the USA military and our many allies and partners, horrors on the scale of September 11, 2001, have not been repeated on our shores.