Defense Secretary Mark Esper told reporters on Friday that the vetting process for foreign military nationals in the U.S., including screenings by the Department of Defense and U.S. embassy personnel, will be reviewed.

\"I want to make sure we're doing our due diligence,\" Esper said, \"to understand what are our procedures.\"

ABC News' Martha Raddatz, Cindy Smith, Elizabeth McLaughlin, Aaron Katersky, Josh Margolin, Jack Date, Mike Levine and Christina Carrega contributed to this report.

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