DETROIT -- General Motors asked a federal appeals court Friday to overturn an order that requires its CEO to meet with the head of Fiat Chrysler by next week to try to settle a lawsuit related to corruption by union leaders.

GM also asked the appeals court to remove U.S. District Judge Paul Borman from the case.

GM is suing crosstown rival FCA alleging that it got an advantage by paying off union leaders to reduce labour costs during contract talks. FCA's former labour chief, Al Iacobelli, is in prison, although the company denies that it directed any prohibited payments.

Borman described the lawsuit as a 鈥渘uclear option鈥 that would be a 鈥渨aste of time and resources鈥 for years if he allows the case to move forward.

The judge ordered GM CEO Mary Barra and Fiat Chrysler CEO Mike Manley to sit down without lawyers by July 1 and reach a 鈥渟ensible resolution of this huge legal distraction.鈥 Borman wants an update from them on a public video conference that same day.

In a court filing, GM called Borman's order a 鈥減rofound abuse鈥 of power.

鈥淭he court possesses no authority to order the CEOs of GM and FCA to engage in settlement discussions, reach a resolution and then appear alone at a pretrial conference eight days later, without counsel,鈥 GM's attorneys said.

鈥淪econd, the court has no business labeling a properly filed federal lawsuit assigned to the court for impartial adjudication `a distraction' or a `nuclear option,鈥' GM said.

Borman can't be viewed as impartial, company lawyers said.

The judge declined to comment. In a statement Friday, Fiat Chrysler said it stands ready to comply with Borman's order. The Italian-American automaker called GM's lawsuit meritless and said it would not distract FCA from its business. 鈥淔CA will continue to defend itself vigorously and pursue all available remedies in response to GM's groundless lawsuit,鈥 the statement said.

Federal agents have been rooting out corruption in the senior ranks of the United Auto Workers. The first wave of convictions in 2017 involved key FCA employees who used money from a jointly run training centre to reward union officials.

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AP auto writer Tom Krisher contributed to this story.