On November 29, 2018, Leon raised concerns surrounding the recent close of a $68 billion merger between CVS Health and Aetna Inc. after learning CVS closed its acquisition before obtaining court approval of an antitrust settlement the companies reached with the government. In expressing skepticism over the merger, Leon cited opposition from the American Medical Association (AMA), which previously warned that the deal would lead to higher premium and out-of-pocket costs for patients purchasing drugs, as well as reduce the quality of health insurance. Leon chided the companies and the Justice Department for treating him like a “rubber stamp," complaining he was “being kept in the dark” about the closing of the merger.