Sessions spoke to a crowd of reporters and federal agents Tuesday morning, April 11, after a tour of the Mariposa Port of Entry in Nogales, AZ.
He also announced that more immigration judges would be added to the bench, to handle an increased load of apprehensions at the border.
Atty. Gen. Jeff Sessions has directed federal prosecutors in the states bordering Mexico to crack down harder on migrants who repeatedly enter the country illegally. There are more than 500,000 cases in the immigration court backlog, according to Syracuse University's Transactional Records Access Clearinghouse.
"For those that continue to seek improper and illegal entry into this country, be forewarned: This is a new era", Sessions said."This is the Trump era".
The Trump administration has threatened to cut off U.S. Justice Department grants to so-called sanctuary cities that fail to assist federal immigration authorities.
Prosecutors in certain circumstances are required to charge repatriated persons who attempt to renter the USA with a felony and additional emphasis will be placed on identity fraud prosecution, such as in cases where undocumented immigrants provide employers with fake social security numbers.
There's a new sheriff in town, his name is Donald Trump, and the era of "catch and release" is over. "As you know too well, this is a booming business", Session said.
Homeland Security Secretary John F. Kelly also issued stringent border control guidelines in February, broadening the scope of immigrants who could be targeted for deportation. In prepared remarks, he derided as "filth" violent cartel and gang members and those smuggling people across the border, and he promised to take a stand against them.
Sessions announced the department is expanding prosecution parameters and focusing on those who cross the border illegally a few times.
That is the message Attorney General Jeff Sessions shared with Customs and Border Protection personnel in Nogales, Arizona, on the USA southern border Tuesday. Trump said repeatedly that he would crack down on criminal organizations that help drive illegal immigration and seek to deport 2 to 3 million undocumented immigrants with criminal records.
Last fiscal year, federal agents made roughly 65,000 arrests, almost half the number made in 2012.
Marijuana arrests also have dropped in the area by about 28 percent, from 1 million pounds in 2012 to 728,000 past year. He chided critics of mass incarceration and the decline in the prison population.
After visiting the border Tuesday, Attorney General Jeff Sessions stopped outside Phoenix in Litchfield Park to speak to a conference of police chiefs.
The same day, Mr Sessions released a memo outlining his border control plans. But his Tuesday speech during his first visit to the border offered the most comprehensive look yet at his plans for federal prosecutions of those in the country illegally.