Robert Mueller must have grown a second head.

He must also have been seized by demons, or brainwashed by enemy terrorists.

The special counsel whose appointment by the Department of Justice drew bipartisan praise has become the bogeyman that congressional Republicans have feared.

Thankfully, not all GOP congressional members have bought into the fear being fanned by those on the far right wing of their party. U.S. Sen. Rob Portman, R-Ohio, says Mueller should be trusted to do the right thing as he continues his probe into allegations that Donald Trump’s presidential campaign colluded with Russians seeking to influence the 2016 election outcome.

This paranoia among some in the GOP suggests that Mueller isn’t the “friendly” party they envisioned when the DOJ appointed him.

Attorney General Jeff Sessions recused himself from the Russia probe, given his role in the Trump campaign and its transition into the presidency. The task of finding a special counsel fell to Deputy AG Rod Rosenstein, who selected Mueller, a former FBI director with impeccable credentials.

Don’t you remember the high praise that poured forth from both sides of the political divide? I damn sure remember it. I joined in that praise, given Mueller’s reputation for meticulous preparation and deliberate purpose.

Even the subject of his probe — Donald J. Trump — is alternately combative and cooperative as it regards Mueller. At this moment, allegedly, the president is willing to talk “under oath” to the special counsel if he gets asked to be questioned. I hope the president doesn’t turn combative again.

As for Mueller’s reputation, I believe it should remain intact. He’s still the same man that Justice Department officials selected for this important and complex job.

So … let the man do his job.