Once upon a time, there was a fairly robust market for temporary health coverage.  Because such policies had certain limits that were not allowed under the Affordable Care Act (notably that they could impose a limitation for the coverage of pre existing medical conditions) that market dried up.  It was recently resurrected by President Trump, who said such a policy made sense, and even though it would do nothing more nor less than what such policies did before, there was a hue and cry about how such policies would hurt the American public.  Responding to this, the state of California proposed and passed a bill that would prohibit such policies from sale.