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Retired Army Special Forces Officer Michael Waltz, who served multiple tours of duty in Afghanistan, joined Bret Baier to discuss President Trump's Afghanistan strategy.

Just before unveiling his strategy in a major speech Monday night, Trump approved sending in more than 4,000 more soldiers to the war-torn country.

Trump's plan also reportedly includes pushing Pakistan to do more to help bring the Taliban to the negotiating table.

Waltz said he's proud of Trump, because making potentially controversial moves like these takes true leadership.

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"Afghanistan's incredibly difficult. It's a regional problem," Waltz said, calling for the additional U.S. troops to focus on advising and assisting the Afghan army, as opposed to fighting on a large scale or engaging in nation-building.

He said it's also important that Trump avoid imposing any arbitrary timelines, as former President Obama did.

"We're going to see some strategy shift here, but at the end of the day, we could not withdraw," Waltz said. "We could not just do what we did in Iraq and let the Islamic State move into Afghanistan and still attack Europe and still attack the United States."

He said he's "absolutely convinced" that ISIS will establish itself in Afghanistan if the U.S. just "walks away."

"And I'm thrilled to hear the president's moved away from that option," he said. "At the end of the day, do we want to fight them in Kandahar and Kabul or do we want to fight them in Kansas City?"

Watch more above.

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