MARK PENN: Stopping Robert Mueller to protect us all.

Flush with 16 prosecutors, including a former lawyer for the Clinton Foundation, and an undisclosed budget, the Mueller investigation has been a scorched-earth effort to investigate the entirety of the Trump campaign, Trump business dealings, the entire administration and now, if it was not Russia, maybe it’s some other country.

The president’s earlier legal team was naive in believing that, when Mueller found nothing, he would just end it. Instead, the less investigators found, the more determined and expansive they became. This president and his team now are on a better road to put appropriate limits on all this.

This process must now be stopped, preferably long before a vote in the Senate. Rather than a fair, limited and impartial investigation, the Mueller investigation became a partisan, open-ended inquisition that, by its precedent, is a threat to all those who ever want to participate in a national campaign or an administration again.

Penn, in case you’d forgotten, served as Bill Clinton’s pollster during his impeachment.