The original question the FBI investigation of the Trump campaign was to answer was a simple one: Did he do it?

Did Trump, or officials with his knowledge, collude with Vladimir Putin’s Russia to hack the emails of John Podesta and the DNC, and leak the contents to damage Hillary Clinton and elect Donald Trump?

A year and a half into the investigation, and, still, no “collusion” has been found. Yet the investigation goes on, at the demand of the never-Trump media and Beltway establishment. Hence, and understandably, suspicions have arisen.

Are the investigators after the truth, or are they after Trump? Set aside the Trump-Putin conspiracy theory momentarily, and consider a rival explanation for what is going down here:

That, from the outset, Director James Comey and an FBI camarilla were determined to stop Trump and elect Hillary Clinton. Having failed, they conspired to break Trump’s presidency, overturn his mandate and bring him down.

Essential to any such project was first to block any indictment of Hillary for transmitting national security secrets over her private email server. That first objective was achieved 18 months ago.

On July 5, 2016, Comey stepped before a stunned press corps to declare that, given the evidence gathered by the FBI, “no reasonable prosecutor” would indict Clinton. Therefore, that was the course he, Comey, was recommending.

Attorney General Loretta Lynch, compromised by her infamous 35-minute tarmac meeting with Bill Clinton — to discuss golf and grandkids — seconded Comey’s decision.

And so Hillary walked. Why is this suspicious?

First, whether or not to indict was a decision that belonged to the Department of Justice, not Jim Comey or the FBI. His preemption of Justice Department authority was astonishing.

Second, while Comey said in his statement that Hillary had been “extremely careless” with security secrets, in his first draft, Clinton was declared guilty of “gross negligence” — the precise language in the statute to justify indictment.

Who talked Comey into softening the language to look less than criminal? One man was FBI Deputy Director Andrew McCabe, whose wife, Jill, a Virginia state senate candidate, received a munificent PAC contribution of $474,000 from Clinton family friend and big bundler Terry McAuliffe.

Also urging Comey to soften the fatal phrase “gross negligence” was key FBI agent Peter Strzok. In text messages to his FBI lover Lisa Page, Strzok repeatedly vented his detestation of the “idiot” Trump.

After one meeting with “Andy” (McCabe), Strzok told Page an “insurance policy” was needed to keep Trump out of the White House. Also, it appears Comey began drafting his exoneration statement of Hillary before the FBI had even interviewed her. And when the FBI did, Hillary was permitted to have her lawyers present.