We still have only one POTUS at a time

Decorum matters. So does protocol. Say whatever you wish about a politician’s flouting of them both — whether you agree or disagree with him — they matter greatly in the conduct of foreign policy.

It is that backdrop, then, that compels me to say that Donald J. Trump is acting disgracefully during this transition period as he prepares to become the U.S. head of state and head of government.

The president-elect’s continual carping while President Obama conducts the affairs of state serves only to undermine the one president we have in power.

The recent decision by the United States to decline to veto a U.N. Security Council resolution condemning Israel over its building of settlements in the West Bank is the No. 1 example of how Trump doesn’t come close to understanding the meaning of protocol and decorum.

He launches routinely into his Twitter tirades, blasting the president’s decision, saying that Israel will have a true friend when the Trump administration takes over.

Consider, too, that another president-elect, Barack H. Obama, called a press conference shortly after being elected in 2008 to declare his intention to let President Bush conduct his policies the way he saw fit. President-elect Obama said he would wait until Jan. 20, 2009, the day he would take office, before weighing in with his own policy pronouncements. Indeed, presidents-elect going back many decades have honored that tradition.

What about that kind of behavior is lost on Trump? Why doesn’t this guy get it? Why can’t he resist the temptation to meddle in foreign policy before it’s his turn?

Trump has less than a month to go before he takes his oath of office, bids goodbye to his predecessor and then settles into the big chair in the Oval Office. This tweet storm he keeps launching is unbecoming of the office he is about to assume — and it damn sure is disrespectful of the man he is about to succeed.

Decorum and protocol, Mr. President-elect? You’ll learn soon enough how much it really matters.