A union representing IRS workers in Kansas City was preparing for the layoff of potentially hundreds of probationary employees.

At least 100 IRS employees were laid off on Thursday and the local union representing these workers anticipates more layoffs, possibly up to 1,000.

On a day when dangerously cold weather forced the Internal Revenue Service to close its downtown processing center, hundreds of probationary employees are on notice that their jobs are likely going away.

While tax season ramps up, the Trump administration’s wave of federal employee layoffs is expected to hit the IRS offices in Kansas City this week, according to one union leader. Workers with less tenure at the already-understaffed location are likely to be most affected.