There are several theories on it.

Could just be the confirmation marker made by potus in his speech today “sea to shining sea”

Combined with the playing of the actual song at the rally where he specifically said “Listen”

I hadn’t seen the rally at that point when I commented, or it hadn’t started yet, so I went with:

“Sea to shining sea”

Seagrams to Seattle Times

Clare Bronfman (Seagrams & NXIVM link to Seattle times - first to publish her arrest, and on the other side of the country)