It's true. He didn't win though.
1. He got into the race at the urging of Jesse Ventura, who won the Minnesota governor's race in 1998 as the Reform Party candidate.
2. Trump dropped out of the 2000 race because he decided that a third-party candidate could never win a presidential election, and that he'd have to basically hijack one of the major party nominations in order to win.
It sounds like it was the perfect campaign for someone who was recruited by a former professional wrestler. LOL.