The Colorado Supreme Court on Monday struck down two proposed ballot measures that would have allowed new congressional district maps for the state's 2028 and 2030 election cycles.

The Democrat-aligned organization Coloradans for a Level Playing Field sought to place ballot measures before voters that would authorize mid-decade congressional redistricting and adopt revised congressional maps for use in the 2028 and 2030 elections, The Hill reported.

The court ruled that the measures violated the Colorado Constitution's "single subject" requirement for citizen initiatives.

Chief Justice Monica Marquez wrote that the group's argument that the measures were inseparable did not satisfy the constitutional requirement.

"We conclude that these are distinct and separate subjects," she wrote.

"Temporarily allowing mid-decade redistricting is not merely the means to implement or effectuate the Initiatives' central purpose of adopting a specific new congressional district map for the 2028 and 2030 election cycles."

Coloradans for a Level Playing Field initially submitted four versions of the proposal, including one that would have both bypassed the state's independent redistricting commission and adopted temporary congressional maps. Two later versions split those provisions into separate ballot measures.

Writing for the unanimous court, Justice Richard Gabriel said those measures also violated the Constitution's single-subject requirement.

"Accordingly, we conclude that Initiative #241, Initiative #242, and Initiative #328 all contain multiple subjects and, thus, the Title Board lacked jurisdiction to set titles for any of them," he wrote.

"To conclude otherwise and to allow initiative proponents to proceed with interlocking measures like those at issue here would allow proponents to achieve indirectly what they could not achieve directly and would endorse an end run around the single subject requirement. This we cannot do."

The proposed maps would have favored Democrats in an effort to gain three additional seats in the U.S. House.

The ruling comes as both parties have pursued redistricting efforts in multiple states ahead of future election cycles.

Voting districts typically are redrawn only after a census at the start of each decade. But Trump urged Republicans last summer to redraw congressional districts to their advantage to try to prevent losses in the 2026 midterms.

The Colorado decision follows a Virginia court ruling that also blocked a Democrat-backed redistricting effort.

The Associated Press contributed to this report.