Posting on social media, the former president said he “VERY SUCCESSFULLY & CONCLUSIVELY” testified last month and saw no need to appear again.
Donald Trump has said he will no longer give evidence at his New York civil fraud trial.
The former US president had been expected to return to the witness stand on Monday.
He was due to be the last big defence witness in the case, which threatens his real estate empire.
Posting on social media, Trump said he “VERY SUCCESSFULLY & CONCLUSIVELY” testified last month and saw no need to appear again.
In the posts, written in capital letters, he said he had “nothing more to say”.
He went on to repeat his claim that the case was a “witch hunt” aimed at hindering his bid to retake the White House.
Trump is accused of inflating his net worth to secure loans and insurance policies on more favourable terms. He denies any wrongdoing.
The former president took to the stand on 6 November where he repeatedly sparred with the judge who he described as “extremely hostile”.
Trump gave a series of lengthy answers to which the judge responded: “This is not a political rally”.
His defence lawyers had been due to lead questioning on Monday, although state lawyers could have cross-examined him.
The trial, which has lasted more than two months, was initiated last year when New York Attorney General Letitia James sued Trump over what she claimed was his pattern of misleading banks and insurers.
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The lawsuit accuses Trump, his company and top executives – including his sons Eric and Donald Trump Jr. – of inflating wealth.
The judge, Arthur Engoron, ruled before the trial that Trump and other defendants engaged in fraud.
He ordered that a receiver take control of some Trump properties, but an appeals court has paused that.
The judge is now considering six other claims made in the lawsuit, including allegations of conspiracy and insurance fraud.
Trump is the current frontrunner for the Republican presidential nomination ahead of next year’s election.
This civil case is one of several ongoing legal battles he faces.
Emily Foster is a globe-trotting journalist based in the UK. Her articles offer readers a global perspective on international events, exploring complex geopolitical issues and providing a nuanced view of the world’s most pressing challenges.