Congressional Republicans keep harping on the length of time special counsel Robert Mueller has been investigating whether the Donald Trump presidential campaign “colluded” with Russians who meddled in our 2016 election.

They keep saying it’s gone on too long. They want Mueller to wrap it up now.

Hold on here.

Mueller’s probe hasn’t lasted as long as the Whitewater investigation that ended up with President Clinton’s impeachment; or as long as the Iran-Contra probe; or as long as the Benghazi probe that looked for years to find criminality against Hillary Rodham Clinton.

Mueller has been given the opportunity to find the truth to a highly complicated set of issues. The president keeps saying there was “no collusion.” He keeps calling the investigation a “witch hunt.”

If that’s the case, then let the probe continue to its conclusion.

And has anyone noticed that Mueller’s team has been water tight? There have been zero leaks? Can the president’s team make that claim? No.

Let the special counsel reach his conclusion at his own meticulous pace. Then let the man deliver his report to the nation.

And stop griping, Republican partisans, about the length of time he’s taking.