Donald Trump needs an intervention.

The president of the United States cannot tell the truth. He cannot state simply the reality of any situation he confronts, or that stands in his way.

Trump decided to lie like a rug yet again when he announced his decision to cancel a planned state visit to Great Britain. His excuse? He said former President Barack Obama brokered a bad deal to purchase the site for a new U.S. Embassy in London.

Trump blasted his immediate predecessor for paying too much public money to relocate the embassy.

So, that was his pretext for deciding against visiting the UK?

Two points are worth making here.

One is that his stated reason is as transparently phony as it can possibly get. The president doesn’t need to fabricate a reason to avoid going somewhere. The real reason clearly has to be that Brits cannot stand him. He was going to run straight into the teeth of intense public protests were he to visit Great Britain.

He has insulted British Prime Minister Teresa May; he has hurled ill-founded criticism of London’s mayor, Sadiq Khan, who happens to be a Muslim (and we certainly know how Trump feels about those who practice the Islamic faith).

The second point is this: The deal to purchase the embassy site was brokered under the administration of President George W. Bush. It was finalized in 2008, the year before Barack H. Obama took office.

Donald Trump has a serious grudge against Barack Obama. What fuels it? Is it that the former president exhibited the class and grace that the current president lacks? Is it the former president’s continued high standing among Americans? Is it because of the former president’s racial … oh, you know.

Donald Trump cannot tell the truth. He is a pathological liar.

He needs to enroll in a Liars Anonymous session — if there’s one available … and declare: My name is Donald and I am a liar.