The Trump administration announced on Thursday that it would seek to put in place more stringent work requirements for adults who rely on food stamps, even as the president signed a sweeping farm bill in which lawmakers had rejected stricter rules.

By moving to limit the ability of states to issue waivers to people who say they cannot make ends meet under the requirements for the Supplemental Nutrition Assistance Program, the Agriculture Department found another route to create restrictions, bypassing Congress and drawing immediate criticism that the proposed rule was sure to harm Americans below the poverty line.