Last week, a critique of the police response written by tactical experts and requested by DPS alleged that a Uvalde police officer had a chance to open fire on the gunman before he entered the school. McLaughlin has said that account was inaccurate.
"All they keep doing is piling missed facts on missed facts, and throwing it out there and see what sticks," McLaughlin said.
In a statement, DPS Director Steve McCraw said the video provides "horrifying evidence" that the law enforcement response was a failure.