I am not a betting man, but if I were I might be willing to wager some real American money that Donald John Trump’s allegation of spying within his 2016 presidential campaign is going to go the way of earlier allegations that flew out of his guy’s mouth.

You know … that Barack Obama wiretapped his office; that millions of undocumented immigrants voted for Hillary Clinton; that thousands of Muslims cheered the collapse of the Twin Towers on 9/11; that Sen. Ted Cruz’s father might have been complicit in President Kennedy’s murder; that Obama was born in Africa and not in Hawaii and, thus, was ineligible to run for president in 2008.

It’s all crap. Now the latest.

He accuses the FBI of planting a “spy” in his campaign. He says the deed was done for “political purposes.” He has produced as much actual evidence of this latest assertion as he did for all the others.

None. Zilch.

Even some congressional Republicans are backing the FBI in the face of these allegations from Trump.

The president is reaching deep into his bag of tricks to discredit the investigation of special counsel Robert Mueller, who the Justice Department appointed in 2017 to look into the “Russia thing,” meaning whether Trump might have worked with Russians who meddled in our election.

The FBI has become one of Trump’s preferred bogeymen. He fired the former FBI director, James Comey, because of the Russia investigation. He is calling Comey a liar; he is disparaging the reputation of former CIA boss John Brennan, former director of national intelligence James Clapper and, yes, also Robert Mueller.

Where, though, is the evidence to back up the allegation of “spying” within his campaign? No one has seen it.

If I were inclined to place a bet on this one, my hunch is that there is no evidence to be found. Why? Because it didn’t happen.

Which brings me to the question: How in the name of political sanity does this guy, the president, get away with lying at this level?