Republican presidential nominee Donald Trump called Kamala Harris a “b----” in private, according to a report by The New York Times, as the former president’s polling numbers plunge, and his campaign struggles to stick to an attack strategy against the sitting vice president.

In a statement to NYT, Trump spokesperson Steven Cheung said “that is not language President Trump has used to describe Kamala, and it’s not how the campaign would characterize her.”

However, sources close to Trump told NYT that he has called Harris out of her name on multiple occasions—frustrated by her campaign’s control of the news cycle over the last three weeks.