Updated 7:27 p.m. | The Colorado Supreme Court ruled Monday that GOP Rep. Doug Lamborn has not qualified for the GOP primary ballot.

The court ruled Lamborn violated state rules when collecting the 1,000 GOP signatures needed to qualify for the primary ballot. State law says the signature collectors must be Colorado residents, and the state Supreme Court determined one of the collectors was not, reversing a lower court decision.

Lamborn plans to challenge the ruling in federal court.

“We are disappointed by the outcome and we believe it was wrongly decided,” campaign spokesman Dan Bayanes said in a statement. “We are immediately bringing an action in federal court to overturn the part of Colorado law that deprives voters who have petitioned to have Congressman Lamborn on the ballot of their Constitutional rights.”

Candidates can either collect signatures or receive support form 30 percent or more of the GOP delegates gathered at the congressional district’s assembly to qualify for the primary ballot.