The same could be said about most of the good folks on this forum, right?Not a shred of evidence exists that Trump is a second amendment supporter other than him claiming he is a supporter.
Aside from membership in several pro-gun groups, you wouldn't be able to 'prove' that I (or others) were 2A supporters either.
Trump has likely never had a NEED to show support (or not) of the 2nd amendment. In fact, I would think a 'businessman' would make an effort NOT to publicly share his convictions.
NOW that he is immersed in 'politics' (God help him), he pretty much has to. I take him at his word.