Four House committees on Saturday formally opened a joint investigation into the Jan. 6 Capitol breach. House Intelligence Committee Chairman Adam Schiff (D-Calif.), House Homeland Security Committee Chairman Bennie Thompson (D-Mass.), House Oversight and Reform Committee Chairwoman Carolyn Maloney (D-N.Y.), and House Judiciary Committee Chairman Jerrold Nadler (D-N.Y.) sent a letter (pdf) on Saturday to FBI Director Christopher Wray, National Counterterrorism Center Acting Director Steve Vanech, Department of Homeland Security senior official Joseph Maher, and Director of National Intelligence John Ratcliffe demanding information related to the Jan. 6 breach and the security of coming inauguration. “As the first step, and as described in the annex to this letter, the Committees ask that your organizations produce relevant documents, and schedule briefings, regarding specific intelligence matters associated with the insurrection and threats to the U.S. presidential inaugurations,” the committee leaders, all Democrats, wrote in the letter. The Democrats requested the agencies to …