Rep. Dustin Burrows, the committee’s chairman, is not allowed to release the 77-minute video “corridor” of the law enforcement response because he signed a nondisclosure agreement with the Texas Department of Public Safety, Burrows revealed on Twitter Friday . Burroughs attached two letters to his tweet. In a letter, he asked DPS for permission to release the video. The other letter is a response from DPS saying the agency agrees the video will bring “clarity to the public about the tragic events in Uvalde,” but that the Uvalde district attorney “objected to the release of the video.” Barrow’s tweet says the video he is pushing to release “does not contain images of victims or footage of violence.” On Thursday, Uvalde Mayor Don McLaughlin dismissed a new assessment of law enforcement’s response to the shooting, saying the Center for Rapid Response Training (ALERRT) report “does not provide a complete and accurate account of what happened.” McLaughlin disputed the first part of the report, which said an Uvalde police officer with a rifle spotted the gunman outside the school, but the superintendent either did not hear the officer or responded too late when the officer asked for permission to shoot. “No Uvalde police officers saw the shooter on May 24 before he entered the school,” McLaughlin said in a statement. “No Uvalde police officer had a chance to shoot the gunman.” CNN reached out to Uvalde District Attorney Christina Mitchell Busbee on Friday and Sunday for comment on why she objects to the release of the video, but has not heard back. According to the same source, the Texas House Investigative Committee’s preliminary report will clarify conflicting accounts from previous reviews of what happened on May 24. The report will include verbatim excerpts from sworn testimony, the source said. The next Texas House Investigative Committee hearing is scheduled for Monday, July 11, at 9 a.m. CT in Austin. The full list of witnesses for the hearing has not been released. But Uvalde County Sheriff Ruben Nolasco told CNN on Sunday that he plans to testify Monday. Nolasco said his testimony will be via video conference, not in person. Texas House Speaker Dade Phelan (R) created the three-member committee last month. Burrows, a Republican, was appointed president. Representative Joe Moody (D) was appointed vice chairman. and former Texas Supreme Court Justice Eva Guzman is a member. The purpose of the investigative committee is exploratory. Two other House committees, Youth Health & Safety and Homeland Security & Public Safety, will be tasked with making legislative recommendations.