FBI director Christopher Wray testified before Congress Wednesday where he called the assassination attempt against former President Donald Trump a "threat to democracy."

"The attempted assassination of the former president was an attack on our democracy and our democratic process and we will not and do not tolerate political violence of any kind, especially a despicable account of this magnitude," Wray said in his opening statement.

He added that the FBI is working "tirelessly" to figure out the failures of the rally. 

Wray appeared before the House Judiciary Committee is to be questioned by lawmakers on the security failures by law enforcement including the Secret Service that occurred during the July 13 campaign rally for Trump, now the GOP presidential nominee, in Butler, Pennsylvania.

The FBI is leading the investigation into the incident and so far has not found the motive of gunman Thomas Matthew Crooks, who fired eight shot from a rooftop about 150 yards from the rally – killing one and wounding three including Trump.

This is the third hearing this week on the assassination attempt, with former Secret Service Director Kimberly Cheatle and Pennsylvania State Police Commissioner Col. Christopher Paris testifying at the other hearings. 

Cheatle resigned Tuesday just one day after her testimony in front of the House Oversight Committee. 

Last week, House Judiciary Committee Chairman Jim Jordan, R-Ohio., sent a letter to Wray that stated there are "several unanswered questions about the failures that led to the attempted assassination of a president — the first in over 40 years — as well as the FBI's ability to conduct a rapid, transparent, and thorough investigation in the wake of its recent scandals."

This is a developing story....