Assured Guaranty Municipal Corp. on Monday joined Bank of New York Mellon in filing a motion seeking relief in Jefferson County, Ala.'s bankruptcy case after the county proposed minimal sewer rate increases that some believe may not support the outstanding $3.1 billion of debt.

BNY Mellon, trustee for the sewer warrants, has asked the judge to lift the automatic stay that currently prevents creditors from pursuing a legal challenge against the county. If the bankruptcy judge agreed, creditors could as a state court to impose different sewer rates.

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