Angry Democrats are calling for the Trump administration to investigate after the Air Force announced Monday it failed to enter into a federal database a domestic violence conviction against the Texas church shooter.

If the Air Force had properly reported the court martial, the gunman, Devin Kelley, likely would have been blocked from buying the rifle he used in Sunday’s shooting, killing 26 people.

Sen. Kirsten Gillibrand Kirsten GillibrandSuburban moms are going to decide the 2020 election Jon Stewart urges Congress to help veterans exposed to burn pits The Hill's Campaign Report: 19 years since 9/11 | Dem rival to Marjorie Taylor Greene drops out | Collin Peterson faces fight of his career | Court delivers blow to ex-felon voting rights in Florida MORE (D-N.Y.) sent a letter to Secretary of Defense James Mattis James Norman MattisBiden courts veterans amid fallout from Trump military controversies Trump says he wanted to take out Syria's Assad but Mattis opposed it Gary Cohn: 'I haven't made up my mind' on vote for president in November MORE calling on him to start an audit of each military criminal case over the past decade that required the military to notify the FBI of the outcome, and to see that each notification was made and was accurate.

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“Hearing that the shooter was a former service member with military convictions for domestic violence was even more troubling. However, learning that this senseless act of violence might have been prevented if only the proper form was filled out by military investigators was absolutely devastating,” wrote Gillibrand, a member of the Senate Armed Services Committee.

“If this can happen in one case, it could happen in others. ... I request that you immediately initiate an audit of all military criminal investigative organizations,” she said.

Other Democrats issued similar calls.

Rep. Joaquin Castro Joaquin CastroHispanic Caucus members embark on 'virtual bus tour' with Biden campaign Hispanic caucus report takes stock of accomplishments with eye toward 2021 Democratic lawmakers call for an investigation into allegations of medical neglect at Georgia ICE facility MORE (D-Texas) said on CNN Monday that the Air Force not reporting the conviction was “a deadly failure.”

“A deadly failure, a colossal failure, they need to make sure it doesn’t happen again,” he said.

“There’s going to be a lot of remediating that has to go on to track down anybody else who might have fell through the cracks, whose records they might not have forwarded,” Castro added.

Sen. Richard Blumenthal (D-Conn.) demanded the Department of Defense give answers on “how this process failed.”

“Air Force failure to report gunman's domestic violence convictions seems to violate statutory duty. How many others unreported?” he tweeted.

Air Force failure to report gunman's domestic violence convictions seems to violate statutory duty. How many others unreported? https://t.co/MrVR9zBxBy — Richard Blumenthal (@SenBlumenthal) November 6, 2017

As a member of Judiciary & Armed Services Committees, I'll call on DoD/DoJ to provide clear picture of where, why & how this process failed. — Richard Blumenthal (@SenBlumenthal) November 6, 2017

Sen. Jack Reed John (Jack) Francis ReedWhen 'Buy American' and common sense collide Hillicon Valley: Russia 'amplifying' concerns around mail-in voting to undermine election | Facebook and Twitter take steps to limit Trump remarks on voting | Facebook to block political ads ahead of election Top Democrats press Trump to sanction Russian individuals over 2020 election interference efforts MORE (D-R.I.), the ranking member of the Senate Armed Services Committee, said each branch of the military must "investigate to determine if there are systemic issues that result in failure to report information on violent crimes” to the FBI and the National Criminal Information Center database.

“The Texas church shooter should not have been able to legally purchase and own a gun. Clearly there was a breakdown in the system that needs to be addressed immediately,” Reed said in a statement.

“All necessary steps should be taken, administratively and legislatively, to ensure that such a failure does not happen again,” he said.