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A top member of the Trump Justice Department called for full enforcement of federal immigration law in order to extinguish the threat violent gangs pose to America.

John Cronan, acting assistant attorney general for the DOJ's criminal division, briefed reporters prior to White House Press Secretary Sarah Sanders' daily Q & A.

Cronan, who previously worked with the key U.S. Attorney's office for the Southern District of New York State, said he has oversight over 700 prosecutors in the criminal division.

He called MS-13, an extremely violent gang from El Salvador, the most "violent, murderous gang [that] has infiltrated our country."

Cronan said the MS-13 problem is approaching critical mass, with thousands of members in Los Angeles, the Capital Beltway region and Long Island, N.Y.

"[It] lives by and rules by... indiscriminate violence," he said.

"We will take all lawful measures to end this scourge on our communities," Cronan said. "When we fail to enforce immigration laws, [we] allow future MS-13 gang members into [the] country."

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He said MS-13 replenishes its imprisoned membership by simply sending more gang members from San Salvador across the U.S.-Mexico border.

Cronan gave real life examples of MS-13's violence, mentioning a 15-year-old girl from Gaithersburg, Md., near Rockville.

He said the girl was stabbed thirteen times with a stake, and the MS-13 members sent the video of the execution to leaders in El Salvador before dumping her body under an Interstate 495 overpass several miles away.

Cronan also pointed to a case in Central Islip, N.Y., where a young victim was bludgeoned with a fire extinguisher and then stuffed inside a drainage pipe to die.

Watch more above.

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