Can we trust POTUS to tell the truth — ever?

Now that we’ve pretty much established that Donald J. Trump is a serial liar, let’s ponder what this might mean as he talks to other world leaders.

Do they believe him when he pledges the United States to a certain policy? Can they trust that his word is good? Will they be able to conduct their own policies knowing that the U.S. president has their back?

Trump has demonstrated repeatedly that his word is good — until he changes his mind.

He promised to stop using Twitter once he became president; he said millions of illegal immigrants voted in the 2016 election; Trump allegedly witnessed Muslims cheering the fall of the Twin Towers on 9/11; he said he “knows more about ISIS than the generals”; Trump asked several federal prosecutors appointed by his predecessor to stay on the job, then demanded their resignations; he has accused Barack Obama of wiretapping his campaign offices.

He once said “the shows” provide him with all the knowledge he needs to deal with foreign crises. Trump has said he is his own primary adviser, that he has a “great mind.”

There’s more examples to offer. But in all of those, either he told a flat-out lie or has failed to produce a shred of proof to back up anything he has said.

How does the president of the United States take that record of prevarication to the negotiating table with other foreign leaders? And how do they know whether to believeĀ a single thingĀ this individual says?

Ladies and gents, we have elected a patently untrustworthy man as president.