McChrystal broke with Mattis's decision to send 4,000 additional troops to supplement the about 8,400 troops already in the country, warning against the possibility of the USA footprint in the country becoming too large.
Sen. Lindsey Graham, R-S.C., said, "I'm glad that Trump is smart enough to understand that you know more than he does and he is empowering you to make us safe".
Nevertheless, there are at least another 2,000 US troops in Afghanistan not included in the official count.
FML's were effectively caps set by the White House on the number of troops that could be deployed to each country.
Four months ago, Army Gen. John Nicholson, who commands USA and global forces in Afghanistan, said he needed several thousand more troops.
Speaking under the condition of anonymity, a Trump White House official told the Associated Press that Defense Secretary Jim Mattis has chose to deploy approximately 4,000 more troops to Afghanistan, according to a report published on Thursday evening.
During testimony on June 13 before the Senate Armed Services Committee in support of President Trump's Defense Department budget request for Fiscal Year 2018, Defense Secretary James Mattis (shown) asserted, "We are not winning in Afghanistan right now".
This decision is part of a broader strategy we are developing that addresses our role in Afghanistan and beyond.
His new strategy is a work in progress, Mattis said, and "does not at this time change the troop numbers in Afghanistan".
Think about that. After almost 16 years and a trillion dollars spent, the USA is "not winning" in Afghanistan, which is, to put it honestly, an admission of defeat.
The report cited a statement made by General Nicholson in February saying that he needed a "few thousand" more troops. More troops would be contributed by other North Atlantic Treaty Organisation nations.
"I think there's going to have to be an adequate ground force, but I don't think it should be primarily American", McChrystal said. However, the danger continues to evolve and that danger requires a commitment to defeat terrorist organizations that threaten the United States, other nations, and the people of Afghanistan.
It is now time to ask the same question of President Trump.