The discussion about the investigation into the “Russia thing” has taken a fascinating new turn, thanks to none other than an independent counsel whose probe into Bill Clinton resulted in the former president’s impeachment.

Kenneth Starr said this morning that special counsel Robert Mueller ought to consider the impact of Donald Trump’s apparent lie about firing Mueller.

Speaking on ABC News’s “This Week” talk show, Starr noted that Trump’s repeated statements that he has never considered firing Mueller are exactly counter to what the New York Times and other media are reporting: that Trump actually decided to fire Mueller but backed off when the White House counsel threatened to quit.

How does Starr’s credibility on this matter stack up? In 1998, he said that President Clinton’s public denials about an affair with Monica Lewinsky formed one of the bases for his eventual impeachment.

Do you get it? If Trump has lied to the public about whether he wanted to fire Mueller and the news accounts prove to be accurate, are there, um, grounds for impeachment?

Starr said the president has broad authority to fire anyone. “He can ask for Mueller to be fired for any reason,” Starr said on “This Week.” “The president’s power is extremely broad, as long as he’s not engaged in discrimination or accepting bribes.”

But would his decision to fire Mueller — if it’s true — be because of an intent to block an investigation into whether the Trump campaign colluded with Russians who hacked into our national electoral system? If so, does that constitute an obstruction of justice?

Let me think. Oh yeah! President Clinton was impeached, too, for obstruction of justice.

And the drama continues to mount.