President Trump told a military crowd near San Diego on Tuesday that he believes the U.S. may need to create a new military branch for outer space, providing a boost to an idea that has so far struggled to gain momentum in Congress as well as the Pentagon.

“My new national strategy for space recognizes that space is a war-fighting domain, just like the land, air, and sea. We may even have a space force, develop another one: Space Force.” Trump said in a speech at the Miramar Marine Corps Air Station.

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