Republicans’ effort to repeal the Affordable Care Act but leave it intact for a few years likely would cause some insurers to leave the market or raise premiums, according to a new study.

The study from the center-left think tank Urban Institute interviewed 13 insurers that offer Obamacare plans in 28 states. The study was published Thursday as House and Senate Republican leaders map out a timeline for repealing the law but leaving it in place while an alternative is approved.