A bill which would legalize civil unions for gay and lesbian couples appears to be dead as the Colorado legislative session comes to an end.

Republican House Speaker Frank McNulty on Tuesday announced that lawmakers had reached an impasse on the measure.

“We have reached an impasse,” the AP quoted McNulty as saying. “It is unfortunate that there will be items that will not receive consideration by the House tonight because of this impasse.”

The measure cleared a third and final House committee to proceed to the floor earlier on Tuesday with the help of a lone Republican, Representative Cheri Gerou.

On the House floor, Democrats wrangled with Republicans, accusing them of a filibuster on civil unions. When Democrats used a procedural move to try to stop debate on other bills, Republican leaders responded by declaring an indefinite recess.

“They want this bill to be heard last,” Republican Rep. Mark Waller told reporters. “They want us to be in this circumstance right now so they can increase their chances of taking a majority back in the state House next year.”

Democratic Rep. Mark Ferrandino, who sponsored the measure in the House after a Republican sponsor could not be found, tweeted: “Saddened to see #civilunions die from games being played by Republican leadership. We will continue to fight, this will happen.”

Nearly 30 bills were left unheard, leaving some hope that the measure could be revived this year during a special session.

At least five Republicans had indicated support for civil unions in the House, where Republicans enjoy a 1 seat majority. The Senate earlier approved the measure, and Governor John Hickenlooper, a Democrat, backed it.