Current and former U.S. border officials are warning of an impending crisis at the southern border due to the Biden administration’s immigration stances.

Tens of thousands more Central Americans and Mexicans are being encountered by Customs and Border Protection federal law enforcement personnel at the U.S.-Mexico border each of the past few months than the same period a year ago. But national security officials are sounding the alarm that this surge is just a preview of what is to come in late January and February.