Three Texas-based air traffic controllers have resigned because of the government shutdown, according to a CBS News affiliate.

Nick Daniels, the president of the Fort Worth chapter of the National Air Traffic Controllers Association (NATCA), told CBS 11 on Thursday that one of the air traffic controllers worked at DFW Airport and the others were assigned to Addison Airport in Dallas County.

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He added that while the Federal Aviation Administration has said there is no security concern due to understaffing during the partial government shutdown, the reality is different.

“They are not operating at 100 percent,” Daniels said. "They are missing things that they normally would not miss."

Air traffic controllers are among the federal workers deemed essential, meaning they are required to work without pay during the partial government shutdown, which is now in its 35th day.

NATCA, the Air Line Pilots Association and the Association of Flight Attendants-CWA issued a joint statement Wednesday saying they had a “growing concern for the safety and security of our members, our airlines, and the traveling public.” “While we are sounding the alarm, unfortunately we have the front seat to watching this unravel and crumble,” Daniels told CBS 11. "We need somebody to hear and listen." Roughly 800,000 federal workers have either been furloughed or are working without pay since Dec. 22. The shutdown is the longest in U.S. history.

The funding lapse stems from a dispute between President Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE and congressional Democrats over the White House's demand for $5.7 billion in funding for a wall along the U.S.-Mexico border.