Seven additional members of the U.S. House of Representatives have signed on to a letter being circulated by a bi-partisan group of federal lawmakers.

U.S. Reps. Keith Ellison, D-Minn., Tom Petri, R-Wis.,  Luis Gutierrez, D-Ill., William Owens, D-N.Y., Paul Tonko, D-N.Y., Carolyn Maloney, D-N.Y., Mike Quigley, D-Ill., have all signed on to the letter, which urges lawmakers to support $300 million for the Great Lakes Restoration Initiative in the fiscal year 2013 budget.

The letter—initiated by Reps. John Dingell, D-Mich., Steve LaTourette, R-Ohio, Sander Levin, D-Mich., and Louise Slaughter, D-N.Y.—now has 23 co-sponsors.