Lender Processing Services Inc. has petitioned the state’s high court to overturn a ruling that allowed Cohen Milstein’s Betsy Miller to be associated as counsel to Nevada Attorney General Catherine Cortez Masto. Masto has a pending complaint alleging that Lender’s robo-signing of mortgage documents contributed to the state’s economic recession.

In its brief, Lender argues that the attorney general’s office violated a state law in hiring Cohen Milstein on a contingent fee basis and that, by granting the outside firm considerable authority in the case, has held the company hostage in settlement negotiations. Masto’s office has insisted that its actions were legal.