WASHINGTON (Dow Jones)--U.S. lawmakers introduced legislation Thursday that would amend federal law that requires companies to notify communities of mass layoffs or plant closings.

Congress passed a federal law in 1988, known as the Warn Act, to give workers and communities 60 days advance notice to adjust to closings or mass layoffs. Currently, the federal law is only invoked at companies with at least 100 employees that lay off 33% or more of their work force.

Lawmakers say the federal laws' "effectiveness has been undermined by existing loopholes and weak enforcement." The remedy to this is modernizing the federal law by closing loopholes and strengthening enforcement," said Sen. Sherrod Brown, D-Ohio, who introduced legislation in the Senate.

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