With roving teams of ICE agents backed up by the FBI and other federal law enforcement arresting hundreds of undocumented immigrants here, the question is: will those efforts be shut down along with the rest of the federal government or carry on? 

And what about the military threat from The White House? Will soldiers soon roll into Chicago as President Donald Trump has promised, using the city as a military training ground as he said on Monday? 

Thousands of federal employees are now sidelined in Chicago and across the U.S. after government leaders failed to reach financial consensus and stopped paychecks to more than two million federal workers.

But one function continues unabated in Chicago: Immigration and Customs Enforcement making arrests of undocumented immigrants, along with the Trump administration plan to deploy National Guard units, in all likelihood.

"Unfortunately, the president is likely to keep the militarization going. He can do that there because there are emergency personnel and military personnel that he can keep on the job,” said Illinois Gov. J.B. Pritzker. “He is likely to do that while people who deserve to get their Social Security checks and Medicaid and SNAP and we can go on while they go without. And instead, militarization will go on while innocent and vulnerable people will suffer."

An NBC5 Investigates review of federal closure plans shows ICE employees are largely exempt from the shutdown, meaning those operations will continue.

ICE agents are among almost 90% of all Homeland Security employees to remain working, although without pay until after the shutdown ends.

In the meantime, DHS plans reveal about 23,000 Homeland Security employees are being furloughed.

At O’Hare and Midway airports in Chicago, TSA agents are being required to work without pay until the shutdown ends.

There's no telling how long the shutdown will last, though the longest federal shutdown, which occurred in 2018 during Trump's first term, lasted 34 days.

The union representing TSA officers is concerned.  

"We're looking for bombs, weapons stuff like that,” said Joe Shucker of the American Federation of Government Employees. “You can't miss, right, so you don't want officers with added stress: ‘how am I going to pay my bills?"

In Chicago the FBI and other federal law enforcement agencies continue to do criminal case work, but Pritzker says he is concerned that government contractors may end up losing money during the shutdown, affecting thousands.

"The agencies don't get reimbursed for the services that they provide,” said the governor. “So if the shutdown goes on for some period of time, that's where you'll see the problem."

Some federal shutdown questions are still being answered tonight here in Chicago, but perhaps the most puzzling closure we discovered is at Homeland Security's cyber agency. The office protecting America from widespread computer attacks by foreign adversaries, long thought to be targeting the nation's utility grids, will see only a third of its employees retained during the shutdown. And that’s on top of the agency already losing most of its leading officials to resignation and early retirement.