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Attorneys for Edward Vrdolyak filed an emergency petition Friday, according to The Chicago Tribune.
Attorneys said the 84-year-old suffers from medical conditions including dementia and has a compromised immune system that would put him at higher risk for severe illness or death.
RELATED: Former Chicago Ald. Ed Vrdolyak sentenced to 18 months on tax evasion conviction
The motion seeks that his sentence be reduced to time served.
A hearing for the motion has not been set.
Vrdolyak began serving his sentence in November after several delays related to the pandemic. He's a former Chicago alderman nicknamed "Fast Eddie" for his backroom dealing.
RELATED: Ex-Ald. Ed Vrdolyak pleads guilty to tax evasion charges
He pleaded guilty in March 2019 to a tax charge alleging that he obstructed an IRS investigation into payments to and from his friend and associate related to Illinois' $9.3 billion settlement with tobacco companies in the late 1990s. Prosecutors said Vrdolyak had been paid at least $12 million in fees stemming from the settlement even though he did no legal work on the case.