The share of recipients who aren’t eligible has grown sharply since the expansion began in 2014.

Medicaid expansion was a key component of ObamaCare. In 2014 when the expansion started, the feds stopped doing audits of states’ Medicaid eligibility determinations. The Obama administration’s goal was to build public support for the new law by signing up as many people as possible. Now, after a four-year hiatus, the Centers for Medicare and Medicaid Services have begun auditing program eligibility again. According to a report released Monday, the audits found “high levels of observed eligibility errors,” meaning a significant number of people are enrolled in Medicaid who shouldn’t be.