Oregon Attorney General Ellen Rosenblum has called on a federal judge to reject the National Organization for Marriage's (NOM) attempt to intervene in a lawsuit challenging Oregon's ban on gay marriage.

Rosenblum is among a handful of Democratic attorneys general who have refused to defend such bans in court.

NOM, the nation's most vociferous opponent of marriage equality, filed a motion to intervene in the case on April 21, 2 days before U.S. District Judge Michael McShane heard arguments in the case.

(Related: Oregon to judge hearing challenge to gay marriage ban: No rational reason for ban.”)

In a brief filed Friday, Rosenblum said that NOM's “motion should be denied as untimely.”

“Delay would not be a particular factor here if NOM had acted with reasonable speed when it knew the Attorney General's position, in February,” Rosenblum stated in her brief. “It chose not to, and should not be rewarded for its delay by obtaining its own separate briefing schedule, its own hearing on its own arguments, and a later decision on the plaintiffs' rights.”

Rosenblum also countered claims by NOM President Brian Brown that his group was delayed because it was unaware of Rosenblum's position until March.

“NOM has not given any good reason for its decision to wait. NOM president Brian Brown has submitted a sworn declaration that he did not learn until March 2014 'that the Attorney General of Oregon and the other defendants in this case were not going to defend Oregon's marriage laws in this litigation.' That isn't true. In the motion itself, NOM says that it learned the state defendants' position when they filed Answer on February 24, 2014. That is closer, although it is not the correct date either. … NOM learned the state defendants' position and publicly criticized it on February 20, 2014.”

Rosenblum also argued that NOM would not have legal standing to appeal any decision to a higher court.