WASHINGTON —

The Pentagon says it is investigating Democratic Sen. Mark Kelly of Arizona for possible breaches of military law after Kelly joined a handful of other lawmakers in a video that called for U.S. troops to refuse unlawful orders.

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The Pentagon’s statement, which was posted on social media on Monday, cited a federal law that allows retired service members to be recalled to active duty on orders of the defense secretary for possible court-martial or other measures. Kelly served in the U.S. Navy as a fighter pilot before going on to become an astronaut. He retired at the rank of captain.

It is extraordinary for the Pentagon, which until the second T

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