A Senate bill to gut Obamacare would increase the number of uninsured people by 32 million and double premiums on Obamacare’s exchanges by 2026, according to an analysis from the nonpartisan Congressional Budget Office.

The analysis is of a bill that passed Congress in 2015 that would repeal Obamacare’s taxes and some of the mandates. Republicans intend to leave Obamacare in place for two years while a replacement is crafted and implemented.