A picture says a thousand words...

Trump joined living ex-U.S. presidents today to commemorate the life of former President George H. W. Bush.

Warmth between the current occupant and former occupants of the White House was absent.

Trump, the one-time New York "businessman," and his third wife Melania, joined the group that included former President Jimmy Carter and his wife, Rosalynn.

The president did not attend a service for Republican Senator John McCain, who died earlier this year, and had to be talked into keeping the American flag at half-staff over the White House.

For Bush, Trump declared a day of mourning.

Bad feeling between Trump and his predecessors appeared hard to set aside.

Trump’s behavior contrasted with that of his presidential counterparts.

The Clintons chatted amiably with the Obamas before the current president arrived.

George W. Bush shook hands with the full front row of presidents and their spouses.

The 43rd president, in his eulogy, hailed his father’s friendship with Bill Clinton, who vanquished the elder Bush in the 1992 election.

That kind of friendship is unlikely to materialize with Trump.