Why is the media talking about this issue at all? Hmmmmm.

The allegations are corroborated by more than one person present at the call. And then there's the elephant in the room; Trump denied the allegation, which, historically speaking, means it's likely true. 

Prototypical self-goal. Common problem for a habitual liar in public life, everything is recorded and so easy to check. Just like the boy scout incident; it's like he makes himself look bad on purpose. Unfortunately, POTUS habitually lying is not just gossip rag fodder, not when other heads of state can legitimately claim 'can't trust the US, Trump is always lying' in the context of treaty agreements and trade deals. It's like Trump has never figured out that in interpersonal relations, it's not 'The Deal' but it's the ongoing relationship that is important.