Republicans on the House Oversight Committee sent letters to a dozen CEOs of major drug companies warning that information they provide to the committee could be leaked to the public by Democratic chair Elijah Cummings in an effort to tank their stock prices.

Cummings requested information from 12 drug companies such as Pfizer Inc., Johnson & Johnson, and Novartis AG in January as part of a broad investigation into how the industry sets prescription drug prices.

In their letters, Reps. Jim Jordan and Mark Meadows — leaders of the hardline conservative House Freedom Caucus — imply that Cummings may be attempting to collect the information in order to bring down the industry’s stock prices.

They write that Cummings is seeking sensitive information “that would likely harm the competitiveness of your company if disclosed publicly.” They then accuse Cummings of “releasing cherry-picked excerpts from a highly sensitive closed-door interview” conducted in an investigation into White House security clearances. “This is not the first time he has released sensitive information unilaterally,” says the letter. The authors say they “feel obliged to alert” the drug companies of Cummings’ actions.