No one had heard of Sam Nunberg until special counsel Robert Mueller decided to subpoena him to testify before a federal grand jury.

So what does this guy do? He blusters and bellows that he won’t answer the call to testify before the panel that is looking into whether Donald Trump’s presidential campaign colluded with Russians who meddled in our electoral process.

And then …

Nunberg has second thoughts. He says he might testify after all.

Oh, but first he went on cable news broadcasts — CNN, Fox, MSNBC — to offer lots of goofy bluster about how he “laughed” at the subpoena.

My initial question was this: Who in the hell is this guy?

I have learned that he attended some meetings and has some inside information about what Donald Trump might know. He has said some disparaging things about his former boss.

This clown is playing with some seriously hot fire if he intends to stiff the special counsel. Mueller is no fool. He’s not a partisan hack. He is a former FBI director and a first-class lawyer. Mueller is known to be meticulous in his approach to evidence-gathering and highly circumspect about what he says in public.

A loudmouth like Nunberg is the antithesis of Mueller. Sadly, he is the kind of clown with whom Donald Trump has surrounded himself.

Come to think of it, he mirrors the Big Man himself.

Weird.