Advocates of aid for Flint, Mich., are putting renewed pressure on Congress to pass a federal funding package in the current lame duck session.

The funding, which would help Flint replace lead pipes that have contaminated the drinking water supply, could come through either the Water Resources Development Act or continuing resolutions necessary to keep the government operating, Flint Mayor Karen Weaver told reporters during a Nov. 28 conference call.

“However we can the funds, we need to get...