The House committee investigating the Jan. 6 riot at the Capitol issued subpoenas on Monday to high-profile allies of former President Donald Trump, including Roger Stone and Alex Jones.

The committee is looking at Stone, a longtime adviser to Trump, and Jones, a conspiracy theorist who claimed that the 2012 Sandy Hook Elementary School massacre in Connecticut was a “giant hoax,” in connection with a rally held near the Capitol shortly before a pro-Trump mob stormed the building in early January.

The committee is demanding records and testimony from three other individuals as well: Dustin Stockton, who the committee said assisted in organizing a series of rallies after the November election; Jennifer Lawrence who was also involved in organizing rallies, including the one that preceded the Capitol riot, according to the panel; and Taylor Budowich, who organized an advertising campaign to encourage attendance at the Jan. 6 rally, the panel said.

“We need to know who organized, planned, paid for, and received funds related to those events, as well as what communications organizers had with officials in the White House and Congress,” the committee’s chair, Rep. Bennie Thompson, D-Miss., said in a statement Monday. “We believe the witnesses we subpoenaed today have relevant information and we expect them to cooperate fully with our effort to get answers for the American people about the violence of January 6th.”

The committee said Monday that Stone was in Washington, D.C., on Jan. 5 and Jan. 6 to “lead a march to the Capitol” and “promoted his attendance at the rallies and solicited support to pay for security.”