The U.S. Supreme Court on Monday turned away a Communications Decency Act challenge to the operators of the Backpage.com online advertising site, but the company’s owner and operators continue to face criminal allegations in California and increased political scrutiny in Washington.

Backpage’s chief executive officer, Carl Ferrer, two of its former owners, its chief counsel and its chief operations office are scheduled to appear Tuesday before a U.S. Senate investigations panel that’s exploring the company’s alleged role in facilitating online sex trafficking. The parents of two alleged sex trafficking victims are scheduled to testify at the hearing.