Sanders is blocking the Obama’s pick to head the Food and Drug Administration, reports The Hill. Sanders already said last year that he was opposed to the appointment of Dr. Robert Califf, who he says is too close to the pharmaceutical industry. Democratic Sen. Ed Markey of Massachusetts had already said he’d block Califf’s appointment until the FDA changed the way it approves opioid painkillers.

For Sanders, though, the fight is more political.

“Dr. Califf’s extensive ties to the pharmaceutical industry give me no reason to believe that he would make the FDA work for ordinary Americans, rather than just the CEOs of pharmaceutical companies,” Sanders said, according to the Hill.

Sanders has also expressed support for Mareky’s position, citing a rising rate of opioid addition in America.

Fighting against the pharmaceutical industry has been a major theme of Sanders’ campaign. He has a number of policy proposals including importing medicine from Canada and restoring discounts for senior citizens. He’s also tied this fight into his push for universal health care.