Former Trump campaign chairman Paul Manafort, who attended the meeting with Trump Jr., is also scheduled to testify before the committee, according to the advisory.

The July 26 hearing will be about “oversight of the Foreign Agents Registration Act and attempts to influence U.S. elections,” the advisory said.

Fox News is told Manafort received the letter inviting him to testify from Iowa Sen. Chuck Grassley, the committee’s chairman, and is looking it over.