If a state Supreme Court ruling is upheld, Rep. Doug Lamborn, R-Colo., won’t even be allowed to compete in the primary election to keep his seat.

Lamborn’s petition, according to the court, was wrongfully certified because signature collectors must be residents of Colorado. The use of outsiders brings his number of valid signatures below the requisite threshold. The decision, released by the Colorado’s high court Monday, was prompted by a lawsuit filed by five GOP voters in his district.