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FILE - In this June 8, 2014 file photo, Rosie O'Donnell accepts the Isabelle Stevenson Award on stage at the 68th annual Tony Awards in New York. O'Donnell isn't mincing words when it comes to Donald Trump's presidential campaign. On Monday, Nov. 23, 2015, O'Donnell said:"It's a nightmare." She didn't elaborate, adding only, "That's my quote." (Photo by Evan Agostini/Invision/AP, File) Image Credit: Evan Agostini/Invision/AP

Rosie O’Donnell isn’t mincing words when it comes to Donald Trump’s presidential campaign.

O’Donnell said: “It’s a nightmare.” She didn’t elaborate, adding only, “That’s my quote.”

The actress-comedian and billionaire Republican contender have long exchanged barbs. But his conduct became an issue at the Republican presidential debate in August, when Trump was asked to account for crude remarks he has made about women.

When Trump suggested he had insulted only O’Donnell, Fox News Channel moderator Megyn Kelly corrected him.

The animosity between Trump and O’Donnell dates back years. In 2006, O’Donnell criticised him for remarks he made about a winner of his Miss USA beauty pageant, saying he had no right to be a “moral compass” for the beauty queen.

That unleashed a series of barbs from Trump, who called O’Donnell a “loser” and “slob”, among other insults. In turn, O’Donnell questioned Trump’s business skills and hairstyle and compared him to a “snake oil salesman”.

O’Donnell, a former co-host of the morning talk show The View, made her remarks on Monday while discussing a guest starring role on Wednesday’s episode of Fox’s drama series Empire.