FBI Director Kash Patel on Friday released details on his agency's probe into Thomas Crooks, the man who attempted to assassinate then-presidential candidate Donald Trump in Pennsylvania last year.
FBI investigators processed thousands of pieces of information in the Crooks case, according to Patel.
One rally attendee was killed and two others were wounded before a Secret Service counter sniper opened fire on Crooks and killed him.
"That day, Thomas Crooks came within a quarter inch of destroying this country, and yet, a year and a half later, we still know almost nothing about him or why he did it. That's because, for some reason, the FBI, even the current FBI, doesn't want us to know,” Carlson said.
Carlson alleged that the Department of Justice (DOJ) and the FBI claimed from the beginning that Crooks had no digital footprint.
But Carlson said that he and his staff obtained and confirmed the authenticity of online accounts that belonged to Crooks that showed he had a long history of espousing violence, including calls for assassinations and political violence against prominent Democrats.
The trove of evidence, according to Carlson, showed that Crooks was not a lone wolf who never warned anyone he was planning violence.
He questioned why the FBI would keep such information from the public.
The White House's Rapid Response account quickly dismissed Carlson's allegations, maintaining that it has been transparent about the case since the beginning.
The attempted assassination of Trump sparked major concerns about security failures. Then-Secret Service Director Kimberly Cheatle resigned from her position following the incident.
Routh was convicted on all charges, including attempted assassination of a major presidential candidate. He faces life in prison, with a sentencing date set for Dec. 18.