WASHINGTON — Republican Sen. Susan Collins says the Senate needs to proceed cautiously and in a bipartisan manner as it works to fix flaws in former President Barack Obama’s health care law.

Collins and fellow Republican Lisa Murkowski of Alaska were the only two GOP senators to vote Tuesday against allowing debate of GOP legislation to repeal much of the Affordable Care Act. The measure prevailed thanks to a tie-breaking vote by Vice President Pence.

Afterward, Collins tweeted that “making sweeping changes to the 50-year-old Medicaid program without a single Senate hearing is a mistake.”

Independent Sen. Angus King also criticized the GOP proposal as “misguided legislation.” He said any version of the bill “will hurt millions of people across the country and tens of thousands of hardworking people across Maine.”