Former Trump Organization controller Jeffrey McConney testified that Donald Trump was the only one who could sign checks that were cut from his personal checking account.

"Who had signature authority for checks from the DJT account?," he was asked.

"Just President Trump," McConney responded.

But McConney also testified that in 2017 there were multiple individuals who could have signed checks that cut from the revocable trust, including Eric Trump and then-CFO Allan Weisselberg.

"For checks under $10,000 any of them [could sign]," McConney said. "Over $10,000 needed two signatures"

Eric Trump, who is seated in the first row, did not react when his name was repeatedly mentioned from the witness stand. He continued staring at the monitor to his left.

Trump once told McConney, "You're fired" -- but it was just a "teaching moment," the former Trump Organization controller testified.

McConney shared an anecdote from early in his tenure at the Trump Organization, in the late 1980s -- which might have foreshadowed the iconic catchphrase Trump later brandished on his reality TV show, The Apprentice.

"I would hand-deliver the [cash position] report to him once a week," McConney explained.

On one of those occasions, McConney said he entered Trump's office while Trump was on the phone. After he dropped off the report, McConney said he turned to leave. Trump asked whoever he was on the phone with to "hold on."

"Jeff, you're fired," he said Trump told him, before turning back to his conversation on the phone.

McConney said he waited until Trump rang off. When he did, he said, "Jeff, you're not fired. But my cash balances went down since last week."

"It was a teaching moment," McConney said. "Just because someone is asking for money, negotiate with 'em, talk to 'em -- don't just do it mindlessly."

Trump, sitting at the defense table, appeared to flash a smile as McConney relayed the anecdote.

Prosecutor Matthew Colangelo began his questioning of former Trump Organization controller Jeffrey McConney, who is testifying under subpoena. McConney said the Trump Organization is paying for his attorneys in this matter.

McConney, who oversaw the company's general ledger and managed the accounting department, told jurors that he directly reported to Allen Weisselberg, the former Trump Organization CFO, from "the day I was hired until the day he left."

McConney told jurors that he interacted with Weisselberg on a daily basis.

"Other than having lunch everyday, whenever I needed to. His office was next to mine," McConney said.

Prosecutors have called as their next witness Jeffrey McConney, the former longtime controller at the Trump Organization.

McConney served as the Trump Organization's controller for over 20 years before leaving the company with a $500,000 severance payment amid multiple criminal and civil investigations. He was among the Trump Organization executives who, along with Trump himself, was found liable earlier this year for committing a decade of business fraud.

Prosecutors have said he allegedly received and processed nearly a dozen fraudulent invoices from Michael Cohen to reimburse him for paying Stormy Daniels a $130,000 hush money payment just days ahead of the 2016 election.