This story does not seem to come from Trump. It seems to have been around for about a month, coming from Rubio’s campaign. Reporters knew about it. Then Rubio dropped out and it was abandoned. Until National Enquirer picked it up and published it.
http://blindgossip.com/?p=75482
some knew about it back in December,
http://www.conservativeoutfitters.com/blogs/news/94574273-8-things-you-need-to-know-about-ted-cruzs-sex-scandal