Leaders of more than 150 U.S. law firms with offices in all 50 states sent a letter to the Office of Management and Budget Thursday, urging it to continue funding the Legal Services Corp.

President Donald Trump’s proposed budget has reportedly put funding for the bipartisan nonprofit on the chopping block. “The pro bono activity facilitated by LSC funding is exactly the kind of public-private partnership the government should encourage, not eliminate,” the law firm leaders wrote.