Sen. Susan Collins, whose vote was pivotal in pushing the GOP tax bill forward last week, thought she had a deal to bolster health care protections in exchange for her support.

Having failed to repeal and replace the Affordable Care Act, Congress is now working on a tax overhaul. But it turns out the tax bills in the House and Senate also aim to reshape health care.

Health care appears to have played an unexpectedly robust role in Tuesdays off-year elections, as Democrats swept statewide races in Virginia and New Jersey and voters told pollsters it was a top concern.