President Trump is slamming U.S. air traffic controllers who called out of work during the government shutdown, during which they were forced to stay on the job without pay.

Trump said in a post on Truth Social Monday morning that he was "NOT HAPPY" with controllers who took time off. "All Air Traffic Controllers must get back to work, NOW!!! Anyone who doesn't will be substantially 'docked,'" he wrote.

The Federal Aviation Administration had been contending with a shortage of air traffic controllers since well before the shutdown began, but the crisis deepened when the government closed and controllers received a partial paycheck and then no pay at all.. Some have taken on second jobs, while others have called in sick. Controllers are set to miss their second full paycheck this week.

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