As for Mr. Trump's assertion he will sue the NY Times for their latest hit piece about 30+ year airplane allegations.
The Times' lawyers wisely responded not whether the allegations are true but that they don't hurt Mr. Trump's already established reputation.
Libel involving a public figure requires proving it was false and defamatory....and that it was done with reckless disregard for truth and actual malice.
The easiest potential defense is that it wasn't defamatory. It may be false or at least tough to prove....The haste in publishing may be reckless, and making the case for the Times having malice is actually pretty easy....But proving it's defamatory ? Not that easy as Mr. Trump has a lady's man reputation...Therefore...No libel...Even if it's false.
Mr. Trump has the ability to compete in a libel case as he has money...But in the end you can't win.