National Emergency?

I am not asking whether the declaration of a National Emergency by President Trump is legally or constitutionally justified; the courts - particularly the Supreme Court - will answer those questions.

I am, however, asking these questions: 1) since President Trump stayed in his declaration that "I did not need to do this" - the "this" being the act of declaring a National Emergency - how can he claim it is an emergency if, in his own words, he did not need to do it, and 2) how can he consider it an emergency when he - immediately after making the declaration - jetted off for a few days of relaxing golf at Mar-a-lago?

Quakertrucker