(CNN) The Trump administration is once again slashing funding for a program that helps Americans sign up for Obamacare.

The Centers for Medicare & Medicaid Services announced Tuesday that it would provide only $10 million for the navigator program for this fall's open enrollment season. The move is the latest effort by the Trump administration to undermine the Affordable Care Act.

This past year, navigators only received $36 million in funding, down from $63 million in 2016. The reduction was paired with a 90% cut in Obamacare's advertising budget.

The agency once again defended the decrease by saying that navigators, which usually hail from non-profit and community organizations, are not effective. They enrolled less than 1% of consumers who signed up for 2018 coverage in 34 states using the federal exchange, according to CMS.

Navigators say they don't get credit for all the consumers they help guide through the process but don't actually sign up. Also, navigators assist people with enrolling in Medicaid, which is not reflected in the numbers.

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