On Capitol Hill, Senate Majority Leader Mitch McConnell has scheduled a vote on the Republican healthcare plan today—after multiple previous efforts to put the Republican legislation to a vote failed amid dissent within the Republicans’ own party. Arizona Republican Senator John McCain is set to return to Washington, D.C., for the vote, only a week after being diagnosed with an aggressive form of brain cancer. The Senate will technically be voting to proceed with a version of the Republican healthcare bill passed narrowly by the House, and then the Senate floor will be open to debate and amendments on the legislation. It’s not clear if Republicans even have enough votes to proceed to a debate. If they do, they could vote on anything from the House bill, which would cause 23 million people to lose their health insurance over the next 10 years, to a plan to repeal the Affordable Care Act without replacement legislation, which could lead 32 million people to lose their insurance over the next decade.