(Bloomberg) -- Senate Republicans agreed to begin floor debate on health-care legislation, a hard-fought step amid uncertainty about exactly what plan senators will ultimately be asked to vote on.

The drama of Tuesday’s 51-50 vote -- with Vice President Mike Pence providing the tie-breaker -- was heightened by the arrival from Arizona of Senator John McCain to help the GOP try to repeal Obamacare following his brain-cancer diagnosis last week.

Majority Leader Mitch McConnell of Kentucky began with the debate with two amendments -- one that mirrors an Obamacare repeal bill passed in 2015 by the Senate and vetoed by President Barack Obama and another that contains the most recent version of McConnell’s replacement health bill. Both are likely to fail.

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