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Senator Susan Collins (R-ME) speaks to reporters after Senate Republicans unveiled their version of legislation that would replace Obamacare on Capitol Hill in Washington, U.S., June 22, 2017. REUTERS/Joshua Roberts

All eyes have been on Senator Susan Collins of Maine, one of the few moderate Republicans in the U.S. Senate and a key swing vote on the Senate healthcare bill.

On Sunday, Collins made clear that she had concerns about the bill but would wait for the CBO score to decide whether she would support it or not.

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