Hogg's mother said he will postpone his first year of college to work on the midterm elections.
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Hogg emerged as an advocate for gun control measures after the shooting in Parkland, Florida.
Last month, Fox News host Laura Ingraham mocked him on Twitter after he had been rejected by several universities to which he applied.
Hogg called on advertisers to boycott her show, which some did, including TripAdvisor, Expedia, Wayfair and others.
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Ingraham took a week's leave after apologizing via social media for her tweet that Hogg had "whined" about not getting in to some colleges. Ingraham hasn't discussed that episode specifically, but she promised upcoming stories about conservatives who she says are fighting attempts to silence them.
She returned to the air Monday night and focused on freedom of speech in her first show back, attacking the left's alleged stifling of conservative voices.
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