Colorado Republican Dan Maes insists he's staying in the governor's race despite a chorus of prominent Republicans calling for him to step aside.

Former Senate candidate Pete Coors (R) on Thursday said, "[I]t would be in the Republican party's and Colorado's best interest if Dan would step down so that a more competitive situation with a new, unifying candidate could be put forward."

Maes is under scrutunity for claims he worked "undercover" for the Kansas Bureau of Investigation. But the agency said it has no record of his service during his time as a police officer from 1983 to 1985. Moreover, the chief of police in Liberal, Kan., where Maes worked as a cop, did not remember his department ever being involved in the investigation Maes referenced in his website biography.

Maes was eventually fired from his job in Liberal, and he blamed his dismissal on "corruption."

Coors wasn't the only Republican on Thursday to call on Maes to quit.

Former state Senate president John Andrews said Maes "flunked his job interview."

"The party should cut Maes loose if he does not resign the nomination," he said in a statement. 

He added: "I intend write in a vote for Jane Norton for Governor."

Norton lost to Republican Senate nominee Ken Buck in the primary. Her entry into the race could offer the Colorado GOP a more appealing option than former Rep. Tom Tancredo (R-Colo.), who's running under the American Constitution Party banner. Democrat John Hickenlooper is considered the frontrunner.

Maes insists he's staying in the race. "I am not getting out of the race, and that's all I have to say at this time," he told The Denver Post.