U.S. Immigration and Customs Enforcement officers will need preapproval from a senior manager before trying to deport anyone who is not a recent border crosser, a national security threat or a criminal offender with an aggravated felony conviction, according to interim enforcement memo issued by the Biden administration Thursday.

The narrower priorities are expected to result in a drop in immigration arrests and deportations. Biden officials said the new guidelines — which will be in effect for the next 90 days — will allow the agency to make better use of its resources while prioritizing public safety threats.