The new rules mean 4 out of 5 nursing homes will need more aides and nurses. Unions hailed the change, but advocates say it's not enough care, while nursing home owners say it's an "impossible task."

The U.S. faces a shortfall of about 450,000 nurses and 120,000 doctors in the coming years. The Senate's top health committee, led by Sen. Bernie Sanders, is considering bipartisan solutions.