The New York tabloid has reported that Clinton’s charity gave $2 million to a company owned by a "friend" of the former president.
On Fox and Friends Friday, Trump called in to give his opinion on the cover story: "It's a bombshell. There's no doubt about it."
The GOP frontrunner said: "It's a rough story and a lot of people have been talking about it for years."
The woman is wealthy divorcee Julie Tauber McMahon, a neighbor of the Clintons in Chappaqua, New York.
The 54-year-old business executive is described as the so-called "Energizer," a nickname given to her by the Secret Service for her supposed frequent visits to the Clinton home.
Citing a 2010 Clinton Global Initiative statement, The Post reports that the charity “commits $2 million to support the work of Energy Pioneer Solutions, a company founded to deliver energy savings to communities in rural America.”
Energy Pioneer Solutions is partially owned by McMahon.
IE spoke to Ron Kessler, author of The First Family Detail.
“Unlike Hillary, ‘Energizer’ is very nice to Secret Service agents,” the author said.
Kessler alleges that McMahon and the former president had “timed arrivals and departures to Hillary’s schedule” for rendezvous at the Clinton home.
He said: “In my book. I purposely stuck with what the Secret Service knew and what they saw with this woman, ‘Energizer.’”
McMahon has repeatedly denied any intimate relationship with the former commander-in-chief.
Hillary Clinton's campaign has not responded to the story.