The D.C. government could save roughly $20 million over the next four years if it purges more than 5,100 longtime employees from the payroll as Mayor Adrian Fenty has proposed, according to a fiscal impact statement.

The D.C. Council, however, is putting the brakes on Fenty’s early retirement incentive plan — for now. The mayor, who rolled out his program Monday with a news conference and news release, has again spurred the ire of the council by promoting an initiative that has not yet won legislative approval.