Prosecutors were asking him about former Trump Organization chief financial officer Allen Weisselberg.
Weisselberg pleaded guilty and served time for tax fraud related to his work at the Trump Organization.
His name has been brought up frequently throughout the trial and he also testified before Michael Cohen, telling the court he knew Donald Trump was inflating the size of his Manhattan penthouse in Trump Tower.
On the stand, Trump defended his former employee, claiming people “went after him vigorously and violently because he happened to work for me”.
“I feel very badly about that whole situation,” he says.