Trump's strategy on the war in Afghanistan

With this new strategy, the administration is not revealing how many additional troops could be sent.
2:10 | 08/22/17

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Transcript for Trump's strategy on the war in Afghanistan
Without saying how many more American troops he'll send. Tonight, ABC's chief global affairs correspondent, Martha Raddatz, asking the secretary of state, do Americans know how many more sons and daughters will be sent? Reporter: A rare public about face for president trump. Before he came to office -- Let's get with it. Get out of Afghanistan. Reporter: Also tweeting, we have wasted an enormous amount of blood and treasure in Afghanistan, but now -- My original instinct was to pull out. And historically, I like following my instincts, but all my life, I have heard that decisions are much different when you sit behind the desk in the oval office. Reporter: President trump in that primetime address, said his strategy will be different than his predecessors. No nation-building, no arbitrary timetables. The president promised to wipe out terrorists. When America commits its warriors to battle, we must ensure they have every weapon to apply swift, decisive and overwhelming force. Reporter: But the president would not say how many additional troops. And at the state department today -- Don't the American people deserve to know approximately how many more of their sons and daughters will be going back to Afghanistan in a war that's lasted nearly 16 years? We're not going to signal ahead an increase, a decrease, the timing of any of that. It will be driven by conditions on the ground. And Martha Raddatz with us live from Washington, and Martha, we know that the secretary of defense was considering about 4,000 additional troops. Any new indication tonight of a possible number we're looking at here? Reporter: Secretary Mattis said today there's a number he has authorized to go up to, but wouldn't say what that is. But the top commander for the region said today, you could see additional troops heading into Afghanistan within days or weeks, David. Within days or weeks. Thank you. Next this evening, a tornado

This transcript has been automatically generated and may not be 100% accurate.

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