A bipartisan group of senators is leaning on three telehealth firms accused of tracking and sharing patients’ sensitive personal information with advertising platforms like Google and Facebook.

Sens. Maria Cantwell (D-Wash.), Susan Collins (R-Maine), Amy Klobuchar (D-Minn.), and Cynthia Lummis (R-Wyo.) sent letters dated Feb. 2 to the chief executive officers of Cerebral, Monument, and Workit Health regarding a media report the companies are tracking and sharing patients’ personally identifiable health information with advertisers. The senators asked the companies to reply to a series of questions by Feb. 10.

The letters were sent a day after the announcement of a $1.5 million settlement telehealth company GoodRx agreed to with the Federal Trade Commission over allegations the former shared personal health data with third parties for advertising purposes in violation of the Health Breach Notification Rule. Under the proposed settlement, the first concerning the rule, GoodRx agreed to revamp its user consent and data retention practices.

Cerebral specializes in mental health counseling, Monument offers alcohol addiction assistance, and Workit provides opioid and alcohol addiction treatment, according to their respective websites.

The senators questioned the companies regarding their reported asking patients to answer online personal healthcare questions, such as those concerning substance abuse and mental health, and promising to keep the answers confidential but then sharing the data with advertising platforms like Google and Facebook.

“This data is extremely personal, and it can be used to target advertisements for services that may be unnecessary or potentially harmful physically, psychologically, or emotionally,” the senators wrote.

Klobuchar introduced legislation in August, along with Sen. Sheldon Whitehouse (D-R.I.), to ban the use of personal health data for commercial advertising purposes.

“We take patient privacy very seriously and share the senators’ thoughts about the importance of privacy of patient information,” a Cerebral spokesperson said in an emailed comment. “We are working diligently to answer their important questions and are in the process of responding. We remain committed to working with other responsible parties to establish clear guidelines concerning the evolving technologies that improve the delivery of mental healthcare.”

Monument and Workit did not respond to requests for comment.