Democratic Sen. Mark Kelly, a Navy veteran, joined a handful of other lawmakers in a video last week that called for U.S. troops to refuse unlawful orders.
Long stretches of the border are under the supervision of nearby military bases, empowering U.S. troops to detain people entering the country illegally.
A staff sergeant assigned to Fort Carson allegedly sold cocaine to an undercover DEA agent days before a raid at an illegal club, court documents said.