WATCH: Ex-Trump campaign boss Lewandowski knifes his replacement over plagiarism controversy

Former Trump campaign boss Corey Lewandowski was unceremoniously dumped last month after he reportedly spent much of the time sparring with current Trump campaign chairman Paul Manafort.

In the wake of the plagiarism controversy in Melania Trump's speech on Monday evening, Lewandowski couldn't resist using his platform on CNN to knife his former rival.

In discussing the speech, which clearly lifted at least a full paragraph from a speech Michelle Obama gave in 2008, Lewandowski said that whoever gave Melania's speech the final sign off ought to resign from the campaign.

But then he took it a step further: When the CNN hosts ask if the person responsible for the speech should resign even if it's Paul Manafort, Lewandowski didn't hesitate.

"I think, if it was Paul Manafort, he'd do the right thing and resign," Lewandowski said. "If he was the last person who saw this, and saw this happen, and has brought this on the candidate's wife, I think he'd resign."

Check out the full clip below.