Hail the imperial cult: ancient Rome is reborn on the Potomac.

This week, Donald Trump ascribed to himself the roles of deity and the Chosen One, a first for an American president but definitely not for an emperor. Then, on Friday, he “ordered” US companies “to immediately start looking for an alternative to China”.

The president cited no authority for his directive, but then again it looks like Trump thinks the law and he are one and the same and that Article II of the constitution is a limitless font of power, Congress and the courts be damned. To quote him: “Then I have an Article II, where I have the right to do whatever I want as president.”

None of this should come as a surprise. From the moment Trump became president, he sought to graft upon the office a patina and degree of authority antithetical to America’s foundational documents. When those were being written, Alexander Hamilton lost the battle over whether the president would serve for a lifetime.

But who can forget the spectacle over crowd size less than 36 hours after Trump had placed his right hand on the Bible? Poor Sean Spicer, we hardly knew you.

As Maximus tells Commodus, 'The time for honoring yourself will soon be at an end ... ‘Highness''

Then, this 4 July, Trump figuratively parachuted into the middle of America’s birthday party, putting himself front and center at the Lincoln Memorial in a scene reminiscent of Gladiator, Ridley Scott’s Academy Award-winning tale of Commodus, a debauched and self-venerating emperor.

Trump sought to hijack Independence Day and turn it into a taxpayer-subsidized celebration of self. But this is not just about visuals. It is about substance too. Trump has teased that he just might attempt to stay ensconced in the Oval Office beyond the legal duration of his term.

In May, echoing Jerry Falwell Jr’s contention that the Mueller investigation was a “corrupt failed coup”, Trump posted a now deleted tweet: “Despite the tremendous success that I have had as President, including perhaps the greatest ECONOMY and most successful first two years of any President in history, they have stollen [sic] two years of my (our) Presidency (Collusion Delusion) that we will never be able to get back.”

Months later, in the same breath as he proclaimed that he was “the least racist person”, Trump mused about keeping his job for another 10 or 14 years.

To think George Washington set a deliberate example of staying around for only two terms, and that was before the 22nd amendment and official term limits. As Washington framed things in his farewell message: “The spirit of encroachment tends to consolidate the powers of all the departments in one, and thus to create, whatever the form of government, a real despotism.”

To be sure, some of Trump’s supporters appear to have welcomed the possibility. During the 2016 campaign, Paul LePage, then governor of Maine, thought Trump needed to show some “authoritarian power”. LePage backtracked but the bell had been rung.

Also in May, William Consovoy, the president’s personal lawyer, told a federal judge Congress was powerless to hold the president’s feet to the fire, and that Watergate and Whitewater were examples of congressional overreach. Regarding a House committee’s subpoena to Trump’s accountants, the Oval Office was claimed to be out of bounds.

Hail Caesar! Hello praetorian. As Consovoy saw things: “That is law enforcement … Are you complying with federal law? … I don’t think that’s the proper subject of investigation as to the president.”

Fortunately, the district court didn’t buy what Team Trump was selling. The decision is on appeal to the DC circuit.

Joaquin Phoenix as Commodus, with Connie Nielsen as Lucilla. Photograph: Allstar/DREAMWORKS

Before Trump’s election, Mike Pompeo, then a Kansas congressman, now Trump’s secretary of state, lumped his boss and Barack Obama together. Pompeo warned that Trump, like his predecessor, would be “an authoritarian president who ignored our constitution”. Understandably, Pompeo has now developed a case of selective amnesia. In hindsight he got one thing very wrong: Obama doesn’t hold a candle to Trump when it comes to encroachment by the executive.

In Gladiator, Maximus, the hero played by Russell Crowe, hacks and cleaves his opponents in the arena then shouts to the crowd: “Are you not entertained?”

In Trump’s case, the American public appears to be answering: “No!”

On Friday, the markets also gave a thumbs-down to his equation of Jerome Powell, the chairman of the Federal Reserve, with the Chinese president, Xi Jinping. The Dow plummeted by more than 600 points.

The president’s numbers are under water and he consistently trails Joe Biden, the Democratic frontrunner, in hypothetical match-ups.

As Maximus tells Commodus: “The time for honoring yourself will soon be at an end ... ‘Highness.’”

Election day is less than 15 months away.