The gang is allegedly responsible for a string of murders, most recently accused of killing several teenagers in Long Island, although the gang's U.S. activity pales in comparison to its prevalence in El Salvador, where it originated.
According to Sessions in the United States there are approximately 10,000 members of MS-13 spread across 40 states, while in El Salvador there are an estimated 30,000.
"Because of an open border and years of lax immigration enforcement, MS-13 has been sending both recruiters and members to regenerate gangs that previously had been decimated, and smuggling members across the border as unaccompanied minors", Sessions said. "The weak illegal immigration policies of the Obama Admin. allowed bad MS 13 gangs to form in cities across U.S. We are removing them fast!", Trump tweeted. "If you are a gang member: We will find you".
To combat this wave of violence and protect our communities, we need proactive policing.
"Sanctuary cities are aiding these cartels to refill their ranks and putting innocent life - including the lives of countless law-abiding immigrants - in danger", Sessions said.
Fox will investigate Bill O'Reilly harassment claims, lawyer says
The accusations against O'Reilly prompted major advertisers to abandon his nightly television program, The O'Reilly Factor . Walsh's complaint was recorded with her lawyer, former NBC contributor Lisa Bloom, and posted on YouTube .
The broader mission is focused on strengthening relationships with reservations across the country.
The Obama administration made unprecedented efforts to fight MS-13, targeting the gang's finances by declaring it an worldwide criminal group subject to sanctions by the Treasury Department.
But James Trusty, who headed the department's organized crime and gang section before he left in January, said the group appeared to be experiencing a recent revival in some of those same places.
"Law enforcement in Indian Country faces unique practical and jurisdictional challenges", Sessions said in a statement, "and the Department of Justice is committed to working with them to provide greater access to technology, information and necessary enforcement".
The Trump administration, led by Sessions, has taken a strong stance on sanctuary policies, claiming that local authorities are releasing risky criminals.