Some grudges last a lifetime, but other grudges last even longer. Take the grudge held by Arizona Sen. John McCain against the United States’ duly elected president, Donald J. Trump.

The grudge runs so deep that the 81-year-old, cancer-stricken senator prefers that the president not attend his funeral after he dies, or so the sometimes error-prone New York Times claims.

In a report published Friday, the leftist outlet specifically alleged that people close to McCain have told the White House that if the ailing senator dies because of his brain cancer, only Vice President Mike Pence is to attend his funeral in Washington’s National Cathedral.

His intimates have informed the White House that their current plan for his funeral is for Vice President Mike Pence to attend the service to be held in Washington’s National Cathedral but not President Trump, with whom Mr. McCain has had a rocky relationship.

Could this mean the senator intends to keep his grudge against the president alive (no pun intended) even after his own death?

It admittedly fits given McCain’s long-practiced antagonism toward the president. It seems like he takes a dig at Trump every chance he gets, including even in his upcoming memoir, “The Restless Wave.”

“Flattery secures his friendship, criticism his enmity,” McCain reportedly wrote, according to excerpts reviewed by the media. “It is hard to know what to expect from President Trump, what’s a pose, what’s legitimate.”

McCain likewise reportedly blasted the president for his purported “lack of empathy for refugees, innocent, persecuted, desperate men, women and children,” and dinged him for his diplomatic willingness to praise “some of the world’s worst tyrants.”

For some odd reason the senator has never spoken this passionately about the countless Americans raped or murdered by his beloved refugees.

Nor has McCain shown much concern for the parents whose children were killed by gang-affiliated illegal immigrants.

Just three months ago the Arizona senator proposed an immigration bill with fellow Sen. Christopher Coons that would have provided a path to citizenship for so-called “dreamers” while not even funding the president’s desired border wall.

Recall also that it was because of McCain that the president failed to repeal Obamacare last year. If anyone should hold a grudge, it should be the president, wouldn’t you say?

But it gets worse. Much worse. The so-called Republican senator recently told former Vice President Joe Biden to “not walk away” from politics, suggesting he wants the Democrat politician to run against Trump in 2020.

What type of Republican not only hates his Republican president, but hates him so much that he’d rather a Democrat win the next election?

The honest answer is … probably a Republican who’s just a Republican in name only.