Early Saturday morning, March 4, the 45th president of the United States alleged in a series of  tweets that former president Barack Obama orchestrated a “Nixon/Watergate” plot to tap Trump’s phones at his Trump Tower headquarters last fall in the run-up to the election. Trump concluded that the former president is a “Bad (or sick) guy!”

Sunday morning, Trump called for a congressional investigation.

Trump cited no evidence for his accusation.

Folks, we’ve got a huge problem on our hands. Either:

1. Trump is more nuts than we suspected – a true delusional paranoid. Trump’s outburst was triggered by commentary in the “alt-right” publication, Breitbart News, on Friday, which reported an assertion made Thursday night by right-wing talk-radio host Mark Levin suggesting Obama and his administration used “police state” tactics last fall to monitor the Trump team’s dealings with Russian operatives.

If this is what triggered Trump’s tantrum, we’ve got a president willing to put the prestige and power of his office behind baseless claims emanating from well-known right-wing purveyors of lies.

Which means Trump shouldn’t be anywhere near the nuclear codes that could obliterate the planet, or near anything else that could determine the fate of America or the world.

2. The second possibility is the Obama administration did in fact tap his phones. But if this was the case, before the tap could occur it’s highly likely Trump committed a very serious crime, including treason.

No president can order a wiretap on his own. For federal agents to obtain a wiretap on Trump, the Justice Department would first have had to convince a federal judge that it had gathered sufficient evidence of probable cause to believe Trump had committed a serious crime or was an agent of a foreign power, depending on whether it was a criminal or foreign intelligence wiretap.

In which case we have someone in the White House who shouldn’t be making decisions that could endanger America or the world.

3. The third possible explanation for Trump’s rant is he was trying to divert public attention from the Jeff Sessions imbroglio and multiple investigations of Trump associates already found to have been in contact with Russian agents during the election, when Russian operatives interfered with the election on Trump’s behalf.

Maybe he’s trying to build a case that the entire Russian story is a plot concocted by the Obama Administration – along with the intelligence agencies and the mainstream press – to bring Trump down. This way, he can inoculate himself against more damaging evidence to come.

But if it’s all a big show to divert attention and undermine the credibility of the intelligence agencies and the press, Trump is willing to do anything to keep his job – even if that means further dividing America, undermining trust in our governing institutions, and destroying the fabric of our democracy.

So there you have it. We have a president who is either a dangerous paranoid who’s making judgments based on right-wing crackpots, or has in all likelihood committed treason, or is willing to sacrifice public trust in our basic institutions to further his selfish goals.

Each of these possible reasons is as terrifying as the other.

For Democrats to be the only ones sounding the alarm risks turning it into the new normal of partisanship. For Obama himself to respond would only dignify it.

So the responsibility falls to Republican leaders to stand up and call this what it is: Dangerous demagoguery.

Former Republican presidents George H.W. Bush and George W. Bush, former Republican senators and members of Congress, and current Republican senators and members of Congress, must have the courage and decency to stop this outrage.

We are in a serious crisis of governance, and their voices are critical.