Republicans, struggling to uphold legislative campaign promises under a GOP president with historically low approval ratings, could be headed for a wipeout in 2018 unless they can start winning over voters by passing an appealing agenda.

The dismal warning comes from poll numbers that have grown increasingly dire for the GOP since it took control of the government in January. A particularly troubling poll number for Republicans, released last week by Quinnipiac University, found Democrats with a historic lead on the generic ballot.