Mattis told reporters traveling with him that he spoke for several hours by video conference on Sunday with US Gen. John Nicholson, the top American commander there. Mattis said he will collect his thoughts and then send recommendations to the White House where, he said, President Donald Trump is open to his advice.
Earlier this month, Nicholson told the Senate Armed Services Committee that he needs a few thousand more troops to train and advise Afghan forces.
"The president has been rightfully reticent on it because he's waiting for my assessment and the assessment from the intelligence community," Mattis said during a press conference. "It shouldn't take too long. I've got to integrate a fair number of issues to give a good recommendation for the way ahead."
The Pentagon chief was scheduled to fly into Afghanistan to meet with commanders and leaders on Sunday, but he said bad weather prevented the trip.
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During the hearing, Nicholson told senators that the additional troops could come from the United States or other nations in the US-led coalition.
He noted that when then-President Barack Obama ordered a cut in US troops to 8,400 last year, commanders were forced to hire contractors to do jobs that American forces would normally do.
As an example, Nicholson said that because of the troop cut, the aviation brigade that deployed to Afghanistan was able to bring its helicopters, pilots and staff. But its mechanics had to behind at Fort Riley, Kansas, and contractors were hired instead at a cost of "tens of millions of dollars," affecting the unit's readiness.