WASHINGTON—Pentagon officials are planning options for using federal troops to secure the U.S.-Mexico border against drug traffickers, human smugglers and migrants, a potentially major shift in military priorities ordered by President Trump, officials said Tuesday.

       Use of the armed forces in a domestic role is restricted by laws prohibiting troops from engaging in law enforcement functions except in narrow circumstances. But an executive order Trump signed Monday described border threats normally left to law enforcement agencies as an “invasion" justifying a military response.

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