No one's asking that they be disclosed. Congress frequently meets in executive session.
I understand your concern because in the past, Congress has released returns obtained under this law for purely partisan political purposes. Unfortunately, that would be a Republican Congress that did that.
In the past, Congress has sought individual returns. Most recently, in 2014, Republicans accessed the returns of more than a dozen tax-exempt organizations as part of an investigation of whether the IRS was discriminating against conservative groups. They even released the returns publicly, which many criticized as a violation of their privacy.
https://www.apnews.com/43c5d0c1b2ea8f674c7024034d67675e
Try again.