New Orleans (CNN) Attorney General Bill Barr said the Trump administration will move next month to speed up the use of capital punishment against convicted mass murderers, marking the first policy development in the wake of the two shootings earlier this month that left scores dead in Texas and Ohio.

Legislation that allows for the "imposition of any death sentence without undue delay" in cases of mass murders, as well as slayings of police officers, will be proposed after Labor Day, when lawmakers return from recess, Barr told a national law enforcement gathering in New Orleans.

"Punishment must be swift and certain," he said.

President Donald Trump had directed the Justice Department last week to propose the legislation, and Barr said Monday that he is also working with the FBI to "develop strategies and measures to address" mass shootings and domestic terror attacks, including tools that assist in "detecting potential mass shooters before they strike."

The proposed measure stops short of the wider gun control legislation that many Democratic politicians have called for after the shootings and furthers a pivot toward the r enewed federal use of the death penalty , initiated by Barr last month.

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