Presidential candidate Donald Trump is under fire once again. This time, a lawyer said the real estate tycoon called her "disgusting" when she asked to be excused from a deposition to pump breast milk for her baby.

According to attorney Elizabeth Beck, the 2016 GOP frontrunner had a meltdown while she was questioning him over a 2011 lawsuit for a failed Florida real estate project when she asked to take a break to pump breast milk for her 3-month-old daughter. In response, Beck said Trump became irate and called her "disgusting," according to testimony reported by the New York Times.

"He got up, his face got red, he shook his finger at me and he screamed, 'You're disgusting, you're disgusting,' and he ran out of there," Beck told CNN Wednesday morning.

Beck said the reality star stormed out of the meeting because the "idea of breast pumping so distressed him he really couldn't handle it." Beck also said the reality star called her line of questions "very stupid."

The attorney said the bizarre incident makes her wonder what kind of president Trump would be, should he win the White House next year.

"Is he going to behave like that when he's negotiating with China?" she said. "Non-presidential is the least of what you could call his behavior that day."

Trump's lawyer, Alan Garten, does not deny his client called Beck "disgusting." However he claims Trump was upset because she proceeded to pump her breast milk "in the middle of a deposition."

"In my 20 years of legal practice, I've never seen more bizarre behavior at a deposition. That is what led to his remark," Garten said. He doubled down on his defense, telling CNN in a phone interview, "She was disgusting. She was attempting to breast feed -- to pump in the middle of a deposition, in a deposition room with five lawyers and was not excusing herself."

Garten said Beck began assembling the pump in the deposition room and "started to move the breast pump toward her breast." He also claimed Beck pulled the stunt because "she ran out of questions, and she didn't know what to do."

"This is not about breastfeeding. ... It's just not," Garten said.

Trump also slammed Beck in a tweet Wednesday morning: "Lawyer Elizabeth Beck did a terrible job against me, she lost (I even got legal fees). I loved beating her, she was easy."