CNN's top executive, Jeff Zucker, is undergoing heart surgery and will take a six-week leave of absence from running the news network.
CNN said Zucker made the announcement to his staff Thursday following a morning editorial meeting. His top deputy, Michael Bass, will be in charge during his absence.
The network said Zucker's surgery is elective, to address a condition that he has had for a decade. He's already a cancer survivor. Brian Stelter, CNN's media reporter, tweeted that Zucker assured staff members that he is going to be fine.
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CNN, and Zucker in particular, have been frequent targets of President Donald Trump's campaign against the media.