CNN —

The U.S. Food and Drug Administration will review evidence about the safety and efficacy of mifepristone, one of the drugs used in medication abortion, to investigate how it can be safely dispensed, U.S. Health and Human Services Secretary Robert F. Kennedy Jr. and FDA Commissioner Dr. Marty Makary wrote in a new letter to 22 Republican attorneys general.

Kennedy and Makary said the FDA would conduct "its own review of the evidence, including real-world outcomes and evidence, relating to the safety and efficacy of the drug."

"This Administration will ensure that women's health is properly protected by thoroughly investigating the circumstances under which mifepristone can be safely dispensed," they wrote in the letter, sent September 19.

The letter is a driving concern among abor

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