Apple’s CEO Tim Cook poked fun at President Trump while giving a commencement speech Friday, saying he did not understand how college students managed to hack Trump’s Twitter account.

“You’ve obviously taken over the president’s Twitter account,” Cook said at the Massachusetts Institute of Technology’s graduation ceremony.

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“I can tell college students are behind it because most of the tweets happen at 3 a.m.,” he added.

Cook made the joke at the start of his commencement speech while praising the students for their accomplishments, and jokingly included hacking the president's Twitter.

The CEO’s comments come after BuzzFeed reported that the White House was planning a meeting with Cook, as well as other tech influencers and entrepreneurs.

Trump has had a tense relationship with the Silicon Valley community, which was made more complicated after his decision to withdraw from the Paris climate deal.

Cook criticized the president’s decision saying he did not think it was in the best interest of the U.S.