The gate of a private half-mile border wall constructed in New Mexico was ordered Monday to stay open after officials said it was built on federal land without a permit.

Most of the private wall built over Memorial Day weekend by triple-amputee Air Force veteran Brian Kolfage’s nonprofit group is on private land, but the International Boundary and Water Commission (IBWC) stepped in after the group started building the barrier’s gate on federal property in early June.

“‘We Build the Wall’ did not receive a permit to construct a gate on federal property,” IBWC spokeswoman Lori Kuczmanski told KVIA. “They think they can build now and ask questions later, and that’s not how it works.”

The gate blocked officials from accessing a levee and dam and also cut off public access to a historic monument, IBWC officials said, according to BuzzFeed News.

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The federal agency placed a lock on the gate to ensure it stays open.

Kolfage aggressively shot back at the IBWC’s order on Twitter, saying the agency is a “fine example of over reach” and alleged, without evidence, that it is “planning for mass invasion.”

The IBWC is a fine example of over reach and growing to big. They are over stepping DHS, national security experts and undermining @realDonaldTrump as soon as they locked our gate open we noticed many other gates around el Paso just opened up!! They are planning for mass invasion