Ted Cruz's campaign abruptly canceled wife Heidi's two New York appearances scheduled for this week, RadarOnline.com has learned.

The prez hopeful said Heidi would travel to Wisconsin to stump with him ahead of the April 5 primary — but is that the real reason?

As reported in the new issue of The National ENQUIRER, on newsstands now, sources say Washington insiders are claiming the steadfast Republican has multiple skeletons in his closet, including five mistresses !

"Private detectives are digging into his private life," a Washington insider told the magazine, adding, "The leaked details are an attempt to destroy what's left of his White House campaign!"

Meanwhile, Cruz's plans to slam Republican competitor Donald Trump in his own backyard (despite his distaste for so-called "New York values") have been stalled.

"They said they needed her in Wisconsin to campaign with Ted," Pastor John Gravagna told The New York Post. "They're going to be back next week or the week after."

As RadarOnline.com previously reported, the feud between Trump and Cruz boiled over last week, as the presidential candidates' wives were caught in the middle of a major Twitter war .

After a recent ad featured photos of Trump's wife from a GQ photo shoot in 2000, which was created by an anti-Trump PAC and not Cruz directly, Trump quickly took to Twitter, telling Cruz to "be careful" or he would "spill the beans" on Heidi.

Back in 2005, Cruz's wife was called "danger to herself" when she was experiencing a bout of depression. Could she be hiding something else?