Short-term health insurance plans that the Trump administration wants to expand don’t offer the same benefits of Obamacare plans, a new analysis found.

A study from the health research firm Kaiser Family Foundation looked at how short-term plans cover the same benefits as Obamacare. The healthcare law requires plans sold on Obamacare’s insurance exchanges to cover 10 essential health benefits that include mental health services, prescription drug coverage, and maternity care.

The Trump administration is seeking to expand the duration of the short-term plans from 90 days to nearly 12 months. These plans are cheaper than Obamacare plans because in part they do not have to cover as many benefits.

Kaiser looked at 24 short-term plans marketed in 45 states and the District of Columbia through the companies eHealth and Agile Health Insurance.

It found that 43 percent of the plans do not cover mental health services and 62 percent don’t cover substance abuse treatment. Another 71 percent do not cover outpatient prescription drugs and none of the plans covered maternity care.

Kaiser also found that seven states — Alaska, California, Hawaii, Maryland, Montana, New Mexico, and Utah — don’t cover any of the four benefits.

Short-term plans can also charge sick people more money or deny coverage to them at all, while Obamacare plans are prohibited from doing so.

Obamacare’s exchanges are on the individual market, which is used by people who don’t get insurance through a job or the government.

Kaiser's analysis confirms that short-term plans contain premiums about 20 percent less than the cheapest Obamacare plan available in the same location.

But critics worry that the cheaper price will cause healthy people to flee the exchanges and buy a short-term plan.

The Trump administration contends that it is expanding affordable options for people on the exchanges. Obamacare's exchanges have faced double-digit premium hikes because of a sicker-than-expected enrollee population. Moves by the Trump administration to cut off insurer payments also caused premiums to spike and the repeal of the individual mandate in tax reform starting in 2019 will also raise premiums.