Jon Huntsman should resign immediately as U.S. ambassador to Russia.

John Kelly, the retired Marine Corps general, should hasten his departure and quit as White House chief of staff.

Dan Coats, the former Republican senator, should quit as director of national intelligence.

John Bolton, newly installed as national security adviser, needs to quit, too.

These individuals all have been tossed under the proverbial bus by the president of the United States. Donald J. Trump managed during that jaw-dropping press conference with Vladimir Putin to castigate the U.S. intelligence agencies that have determined Russia attacked our system of government.

Trump has undermined U.S. diplomacy. He has denigrated our intelligence-gathering process. He has weakened the nation he pledged to defend and to strengthen. He has demonstrated a level of ignorance, arrogance and acquiescence that none of us thought would be possible in the president of the United States.

It is enough for Vladimir Putin, the former KGB boss — the top spook in the Evil Empire — to deny doing what the intelligence agencies said he did. Yep, Donald Trump takes Putin at his word, which is about as credible as anything that flies out of the president’s mouth.

I am not holding my breath for any resignations to be forthcoming.

Maybe, though, there might be some spine-stiffening taking place at this very moment.