Not according to the BBC last night who were reporting the Mexican cancellation before any Trumpy Tweet. I'd expect him and his team to try to make it look like they cancelled first....he never comes second after all. Melania will vouch for that.
The real truth is that you don't conduct international diplomacy via Twitter as the ginger soon to be Billy no Mates will find out if he continues to slag other leaders off on social media.
I agree that you could imagine, based on the evidence of his ego, that if the Mexican President did cancel that he would try and make out that it was in fact the Donald playing hardball, but on this occasion I think that it is likely true(ish).
I can imaging the phone call he referred to including some comments from the Mexican President about toning down the rhetoric and it finishing off with a 'joint' lets not bother then.
If Trump was telling this false I would have thought that Mexico would have quickly put that straight and there are plenty of media outlets that would have been quick to run the story
Perhaps I am wrong