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Donald Trump greets supporters at a rally in Virginia. Alex Wong/Getty Images

The first few days of the Trump Taj Mahal, the Manhattan billionaire's massive Atlantic City casino that opened in 1990, were disastrous.

Jack O'Donnell, who was president of the Trump Plaza Hotel and Casino and later had to focus on the Taj Mahal project after three fellow executives died in a helicopter crash, revealed details of the chaotic days to The Post.

It began after Trump learned in the casino's opening week that the state gaming regulators had ordered the slot machines remain closed because the casino did not have a large enough "hard count room," where coins and tokens are sorted at the end of the night.

"Jack, I'm at the Taj," Trump said, in O'Donnell's account. "I got big f------ problems over here ... I've been in meetings with the state all morning. They're not going to let me open. I've got a bunch of f------ idiots down here ... You have to come down here and straighten this out ... I'm going to fire all these a-------."

When O'Donnell arrived at the scene, he found out that Trump had been warned about the size of the room by Deno Marino, the deputy director of New Jersey's Casino Control Commission.

Marino made an exception to the rule, allowing the counters to work in the smaller room by opening a steel door to let cool air flow in.

When the counters finished that night's count of the coins and tokens, the tally was $220,000 short of what the initial count was from the slot machines. It was the biggest mess Marino had seen in the 12 casinos that he saw open.

After that discrepancy, the slots had to stay shut throughout that day and most of the next. Later that day, a worker noticed that the steel door was propped open by a large canvas bag.

It contained the $220,000 in missing tokens.

The room was later enlarged.