Homeland Security officials are bracing for a seismic shift in immigration policy under the incoming Trump administration, prompting some interagency calls as people prepare for the weeks ahead, CNN reports.

One Homeland Security official describing the mood internally as a “mixed bag.”

One of the questions top of mind among those in the department is what will happen to Biden administration policies, like parole programs for certain nationalities that allowed beneficiaries to temporarily work and live in the United States.

“Shell shocked among the political,” another Homeland Security official said.

In his first days in office, President Joe Biden did away with many of the Trump administration’s controversial immigration policies. Now those policies may make a return.

For some at the Department of Homeland Security, that comes as welcome news. Over the last three years, the Biden administration grappled with multiple border crises, garnering fierce criticism internally and externally among Republicans and Democrats.

Biden administration officials ultimately landed on a much harsher stance on the US-Mexico border that resulted in a dramatic drop in migrant crossings over recent months.

Still, some in the department’s immigration enforcement agencies touted Trump’s win.

“There is a lot of optimism and hope,” another Homeland Security official said.