Christ, The Desire of All Nations

For thus saith THE LORD of hosts; Yet once, it is a little while, and I will shake the heavens, and the earth, and the sea, and the dry land ; And I will shake all nations, and the desire of all nations shall come: and I will fill this house with glory, saith THE LORD of hosts (Hag 2:6-7).

This passage is clearly speaking of Christ. That given, some would debate whether it is speaking of his first coming or his second. But . . . in either instance could or can it be said that he is the 'desire of all nations?'

Was he the desire of all nations when he came as Mary's son? Is he presently the desire of all nations as he is expected in his final coming?

This verse says that he WAS and IS. How can that be true?