Attorney General Jeff Sessions vowed before hundreds of senior law enforcement officials Monday that he will not allow the United States to be “stampeded” by illegal immigrants and drug cartels.

“Right now we are dealing with a massive influx of illegal aliens across our southwest border. In April, we saw triple the number from last April. But we’re not going to stand for this. We are not going to let this country be invaded. We will not be stampeded. We will not capitulate to lawlessness,” Sessions told attendees at the Association of State Criminal Investigative Agencies spring conference in Scottsdale, Ariz.