Christopher Steele , the British former spy behind a salacious and unverified dossier about Donald Trump , said he believes one of the most infamous allegations in the document.

Steele told ABCs George Stephanopoulos that the pee tape is probably real, according to a promo for the upcoming series, Out of the Shadows: The Man Behind the Steele Dossier.

The dossier claims Trump in 2013 hired prostitutes in Moscow to perform a golden showers show as he watched.

Supposedly, they urinated on a bed in the presidential suite at the Ritz-Carlton that had been previously used by then-President Barack Obama , and Russian intelligence may have secretly recorded the incident.

Steele said he is prepared to accept that some of the things in the dossier might not be true.

But the pee tape?

I think it probably does exist, Steele said. But I would not put 100 percent certainty on it.

Stephanopoulos asked why the Russians havent released the tape if they have it.

It hasnt needed to be released because I think the Russians felt theyd got pretty good value out of Donald Trump when he was president of the U.S., Steele replied.

Trump last week randomly brought up the alleged pee tape himself, denying the allegations.