According to the report, which cited an unnamed Trump adviser, Trump planned to claim that Slim, a New York Times shareholder and Clinton Foundation donor, was trying to boost Hillary Clinton's campaign by damaging Trumps. The adviser said Trump could launch the attack as early as Friday, the report said.
A spokesman for Slim denied that the media mogul had interfered in the U.S. election, while New York Times publisher Arthur Sulzberger Jr. said Slim had never sought to influence the newspaper's coverage, the WSJ reported.
A Clinton campaign press secretary called Trump's claim a "deranged right-wing conspiracy theory," the report said.
The Slim family owned around 17 percent of The New York Times Co. Class A shares as of March, although the Sulzberger family controls the company, the report noted.