Nikki Benfatto, a personal trainer in New York City, was once married to former Trump World Tower doorman Dino Sajudin, who claims he'd heard a rumor that Trump had a relationship with an employee and fathered her child.
Benfatto, who divorced Sajudin in 2014, said she doesn't believe his story.
"I would describe him as a manipulative, malicious, pathological liar," Benfatto told Inside Edition's Diane McInerney. "I believe that he's exaggerating. I don't believe that he has valuable knowledge."
She says she also doesn't believe Trump fathered a love child.
"Initial reports stated it was a rumor [Sajudin] heard," she said. "Anybody can make up a rumor about anybody. Lord knows he made up rumors about me."
A source close to the doorman, however, calls Benfatto a "disgruntled ex-wife."
In the early stages of the 2016 election, Sajudin reportedly called the National Enquirer tip line about the alleged affair, which he claimed he heard happened in 1989.
At the time, Trump's marriage to first wife, Ivana, was crumbling and he was dating Marla Maples.
The doorman said the National Enquirer paid him $30,000 but the tabloid never ran the story.
The Trump Organization says any claims about a love child are "completely false." The mother of the alleged love child has also called the story "all fake."
Their alleged love child is now 29 and lives in California. She has a master's degree in medical health.
The tower where Sajudin worked is four blocks from the United Nations headquarters in New York City. High-profile residents have included Harrison Ford, Bill Gates, Sophia Loren and former New York Yankees star Derek Jeter.