Two powerful House GOP chairmen on Friday requested an FBI briefing on the Florida school shooting after the bureau admitted standard "protocols" were not followed when it received a tip about the 19-year-old suspect.

Reps. Trey Gowdy Harold (Trey) Watson GowdyContractor awarded 6 million to provide 30 million meals to Puerto Rico only delivered 50,000: report The Memo: Trump doubles down amid some GOP doubts Lawmakers dispute ‘vindication’ for Trump in Intel memo MORE (R-S.C.) and Bob Goodlatte Robert (Bob) William GoodlatteIG poised to reignite war over FBI’s Clinton case McCain, Coons immigration bill sparks Trump backlash What I've learned as a native-born 'dreamer': We are a nation of assimilated immigrants MORE (R-Va.), who chair the House Oversight and Judiciary committees, respectively, sent a letter to FBI Director Christopher Wray requesting information on why the agency did not follow up when it received a tip about Nikolas Cruz.

"In the wake of this tragic shooting, Cruz's past has been sifted through to determine whether there were warning signs that he was capable of such monstrous actions. There were," the lawmakers wrote Friday.

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"On January 5, 2018, the FBI received a tip about Cruz. According to FBI's protocols, this information 'should have been assessed as a potential threat to life.' The Committees are seeking to understand these protocols and why they were not followed in this case," the letter continued.

The GOP chairmen's letter comes hours after the FBI acknowledged it failed to follow up on a tip from someone close to the accused shooter last month. The tipster warned about Cruz's gun ownership and mental instability, and expressed concern about him potentially carrying out a school shooting. The FBI said it did not notify its Miami field office of the tip.

"Under established protocols, the information provided by the caller should have been assessed as a potential threat to life," the FBI said in a statement. "The information then should have been forwarded to the FBI Miami field office, where appropriate investigative steps would have been taken."

Attorney General Jeff Sessions Jefferson (Jeff) Beauregard SessionsDems pick up deep-red legislative seat in Missouri Grassley to Sessions: Policy for employees does not comply with the law New immigration policy leaves asylum seekers in the lurch MORE ordered a review of the FBI and Justice Department's procedures following the bureau's admission on Friday.

“It is now clear that the warning signs were there and tips to the FBI were missed. We see the tragic consequences of those failures," Sessions said in a statement.

“The FBI in conjunction with our state and local partners must act flawlessly to prevent all attacks. This is imperative, and we must do better."

Cruz is accused of killing 17 people and wounding more than a dozen others during a shooting at his former high school. His lawyer told ABC News on Friday that Cruz is willing to plead guilty in exchange for prosecutors guaranteeing they will not to seek the death penalty.