Donald Trump's former campaign manager Corey Lewandowski, now a talking head on CNN, went full 'birther' like his ex-boss while discussing President Obama calling the GOP nominee 'unfit' for office.

Lewandowski asked again and again why President Obama never released his college transcripts. 'And the question was, did he get in as a U.S. citizen or was he brought in to Harvard University as a citizen who was from another country?' Lewandowski said.

The transcripts came up as CNN anchor Don Lemon asked his panel about Obama's criticism of Trump, which he did from the White House yesterday as he hosted a joint press conference with the prime minister of Singapore.

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Donald Trump's former campaign manager Corey Lewandowski asked why President Obama never released his college transcripts, echoing 'birther' statements made by his ex-boss

Corey Lewandowski (far left) got into it with Angela Rye (middle right) over whether President Obama should have criticized Donald Trump from the White House yesterday

'Yes, I think the Republican nominee is unfit to serve as president,' Obama said. 'I said so last week and he keeps proving it.'

Obama later added that Trump is 'woefully unprepared to do this job.'

Sticking up for is former boss, Lewandowski took issue with not just the content of Obama's message, but the place he delivered it.

'If he wants to engage in partisan politics I don't think this is the right venue for it,' Lewandowski said, suggesting that the presidential campaign shouldn't creep into a state visit at the White House.

'If he wants to go on the campaign trail with Hillary Clinton, absolutely he has the right to do that,' Lewandowski said. 'But that also means he becomes fair game for any retort that Donald Trump wants to put on him.'

'I just think that in the decorum of the presidency of the United States ,the East Room is not the place to engage in those partisan attacks,' Lewandowski added.

CNN's Angela Rye, the former executive director and general counsel of the Congressional Black Caucus, pointed out that Obama didn't start it.

'Let me be very clear, Donald Trump has been attacking the president long before he began campaigning for this important office,' Rye said.

'He was the one who was the spokesperson for the birther movement. He was calling for transcripts and saying that the president was an affirmative action admittee at Harvard,' she recalled.

To that Lewandowski asked, 'Did he ever release those transcripts? Did he ever release his transcripts on his admission to Harvard University?'

Trump indeed had been one to push the 'birther' theory, which Obama supporters said was used to delegitimize the country's first black president.

The businessman and reality star eventually forced Obama's hand, and the White House released the president's long-form birth certificate in 2011.

Lewandowski had served as Trump's campaign manager until he was fired in late June. He was quickly picked up by CNN to be a paid commentator with the network's Jeff Zucker singing him praises in a Variety profile of the cable channel.

'I actually think he’s done a really nice job,' Zucker said, pushing back on criticism that Lewandowski was merely reciting talking points.

Last night, his decision to bring up 'birther'-ism confounded his television peers.

In response, Rye was so flummoxed that Lewandowski asked about the president's college transcripts that she started quoting Beyonce.

'In this moment I'm going to Beyonce you,' she said.

'Boy, bye!'