WASHINGTON—The Pentagon is preparing plans for President Trump to draw down forces from Afghanistan by as soon as this autumn, defense officials said, in keeping with Mr. Trump’s call on Tuesday for an American withdrawal.

The Pentagon’s plans include a series of options that range from a complete withdrawal to a partial pullout, officials said. One option would leave approximately 5,000 troops in Afghanistan, and another plan under consideration would leave about 1,500 troops there, according to several officials.

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