House Intelligence Committee Chairman Adam SchiffAdam Bennett SchiffHouse votes to hold Bannon in contempt of Congress The Hill's 12:30 Report - Presented by Altria - Manchin heatedly dismisses rumors of leaving Democratic Party Bannon eyed as key link between White House, Jan. 6 riot MORE (D-Calif.) suggested Thursday that President TrumpDonald TrumpGrant Woods, longtime friend of McCain and former Arizona AG, dies at 67 Super PACs release ad campaign hitting Vance over past comments on Trump Glasgow summit raises stakes for Biden deal MORE played a role in House Republicans' decision to enter a secure area, known as a SCIF, where impeachment witness depositions are held.
In a CNN interview, Schiff said "the storming of the SCIF and all the other high jinks that the president concocts with them" showed a "lack of seriousness."
Host Chris CuomoChris CuomoDemocrats brush off risks of paring down spending package Family attorney: 'Probability is strong' that human remains found belong to Brian Laundrie The Hill's 12:30 Report - Presented by Facebook - Arizona recount to show Trump's loss by even wider margin MORE then asked the lawmaker if Trump "knew what they were doing or had a hand in what they did in storming the SCIF."
"Without a doubt," Schiff said. "That happened the morning after a meeting with these ... Tea Party members who came storming in the next day."
"Much of the Republican party has become a cult of personality around the president," he said later.
Updated: 2:28 p.m.