Federal Communications Commission (FCC) Chairman Ajit Pai implied on Tuesday that tech giants like Google and Facebook should receive more stringent oversight.

Pai made the calls in a blog post on Medium. It comes the day before Twitter, Facebook, and Google will send representatives to testify before Congress.

Twitter CEO Jack Dorsey, Facebook COO Sheryl Sandberg, and Alphabet CEO Larry Page will testify before the Senate Intelligence Committee, according to CNET. Dorsey will also testify before the House Energy and Commerce Committee in a hearing that is expected to address the issue of “shadow banning.”