Conservative commentator Dinesh D'Souza has taken aim at the Obamas once again, this time branding Michelle Obama's college thesis at Princeton University as "illiterate and incoherent."

The comments came after the former first lady spoke in London as part of a book tour promoting her memoir 'Becoming', Daily Mail reports.

During her discussion onstage with Nigerian author Chimamanda Ngozi Adichie, who moderated the event, Michelle said that some of the most powerful people in the world are "not as smart" as they seem to be.

"I have been at probably every powerful table that you can think of," she said. "I have worked at nonprofits, I have been at foundations, I have worked in corporations, served on corporate boards, I have been at G-summits, I have sat in at the UN. They are not that smart."

Nonetheless, Michelle admitted to her audience that she had "a little [bit of an] impostor syndrome."

"It never goes away, that you're actually listening to me," she said. "It never goes away, that feeling that you shouldn't take me that seriously. What do I know? I share that with you because we all have doubts in our abilities, about our power and what power is."

However, D'Souza made sure he addressed her controversial comment about leaders being "not that smart."

"Anyone who has read Michelle's college thesis - a document so illiterate and incoherent that it was written, as Christopher Hitchens put it, in 'no known language' - will chuckle heartily at this one," he wrote in a Facebook post.  

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During Barack Obama's 2008 presidential campaign, Michelle's college thesis made headlines after Princeton University restricted access to it until the election was over.

After several conservative bloggers publicized the restriction, the Obama campaign was forced to release the thesis in full, which was first obtained by Politico. It was only then that Princeton University followed suit and unblocked access to her work.

At the time, renowned author, the late Christopher Hitchens, was quick to tear into the thesis titled 'Princeton Educated Blacks and the Black Community', having been a fierce critic of Obama's presidency before his death in 2011.

According to him, Michelle had made a "narrow choice of subject" simply because she was a "black woman at Princeton."

Speaking to conservative radio host Hugh Hewitt in May 2008, Hitchens criticized the thesis saying, "I mean, you can't really claim you're being educated if the subject of your thesis is what it's like being me at this college. So that, I find partly laughable, and I'd have to add slightly sinister."

Hitchens, who also touched on Obama's work in a Slate article, then summarized the thesis saying it was "hateful, lugubrious, boring, resentment-filled screed written in some very bad form of sociologies."

"The only thing you can definitely tell from the attempt to read it, because I maintain it cannot actually be read, it's a degradation of the act of reading, is that she favors, or views with favor, black separatism, or as she calls it, separationism," he said.

Michelle, who graduated cum laude from the university with a Bachelor of Arts degree in sociology, wrote that she felt like a "visitor" even after three years on the campus.

"My experiences at Princeton have made me far more aware of my 'Blackness' than ever before," she wrote. "I have found that at Princeton no matter how liberal and open-minded some of my White professors and classmates try to be toward me, I sometimes feel like a visitor on campus; as if I really don't belong."

Having said that, Michelle slammed Hitchens' comments on her thesis in her memoir, when she called his criticism "small minded and ludicrous."

"He tore into the college-age me, suggesting that I'd been unduly influenced by black radical thinkers and furthermore was a crappy wrote," she wrote, seven years after Hitchen's demise. According to her, Hitchens had mocked her intellect and tried to make her seem "so foreign that even my language couldn't be recognized."