There is no reason why a President, like any other citizen, can’t publicly call for the Supreme Court to decide a certain way.
Of course, his exhortation has no more Constitutional weight than mine would.
He can say it if he wants, just like he attacked them to their faces in his SOTU show, and lied about their ruling that he complained about.
Doesn’t make it proper.
His solicitor general argued the case to the court.
That’s where the proper communication took place.
O running his mouth, isn’t.