DES MOINES, Iowa (AP) — Republican presidential candidate Donald Trump's corporate website was the target of a cyberattack Monday, the same day a celebrity gossip website published an old mobile telephone number for the billionaire businessman.

Aides to Trump said hackers were able to access non-public pages inside Trump.com, where they posted a tribute to comedian and late-night talk show host Jon Stewart.

The aides described the episode as a prank and not a serious threat. They said the hackers' temporary entry into a low-level page was not connected to any of Trump.com's navigational components, compromised no corporate information and was fixed in less than 30 minutes.

In a separate event, New York-based celebrity gossip and media news website Gawker published a mobile telephone number it said was Trump's.

"It is a very old number. This is not one he uses," said Trump campaign spokesman Corey Lewandowski. "Mr. Trump has several numbers, so he has not experienced any issues."

Gawker said it was publishing the number because Trump disclosed Republican rival Lindsey Graham's cell phone number last month, when the two were at the center of a public feud over Arizona Sen. John McCain's military service.