Federal prosecutors are seeking about three years in prison for two former allies of New Jersey Governor Chris Christie who were convicted of illegally closing lanes at the George Washington Bridge in 2013.

Lawyers for the former allies asked the judge for leniency, saying probation and community service would be more appropriate.

Bill Baroni, a former executive at the Port Authority of New York and New Jersey, and Bridget Kelly, a former aide to Mr. Christie, are scheduled to be sentenced Wednesday in U.S. District Court in Newark, N.J. Prosecutors said Baroni and Kelly were part of a scheme to create traffic jams in Fort Lee, N.J., to punish the borough’s Democratic mayor for not endorsing Mr. Christie, a Republican.

Christie wasn’t charged with wrongdoing.

In a filing made public Monday, prosecutors said Baroni and Kelly should be sentenced to “at the bottom of or modestly below” a range of 37 to 46 months in prison, followed by three years of supervised release. The two committed a “monumental betrayal of the public trust,” they said.

“ ‘The Defendants’ criminal abuse of their government power was truly outrageous and warrants a meaningful term of imprisonment for both Baroni and Kelly,” prosecutors wrote.

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