In March, David Hogg, a student who survived the shooting in Parkland, Florida, called for a boycott of companies that advertise on Laura Ingraham's Fox News show after Ingraham posted a tweet mocking Hogg. She later apologized.

Hogg is now launching a fresh campaign on Twitter after Ingraham compared the migrant child detention centers where children who have been separated from their parents are being held to "summer camps" during her show on Monday evening. He's urging his followers to contact Ingraham's advertisers and request they pull out of the show.

Here's what happened the last time Hogg staged a boycott campaign against Ingraham.

In March, David Hogg, a student who survived the shooting at a high school in Parkland, Florida, called for a boycott of companies that advertise on Laura Ingraham's Fox News show in response to a tweet that mocked Hogg by saying he "whines" about college rejections.

"Soooo @IngrahamAngle what are your biggest advertisers ... Asking for a friend," Hogg responded, adding the hashtag #BoycottIngramAdverts.

He later tweeted a list of companies he said were advertisers on Ingraham's show and urged his followers to contact them. It appears to have worked, as several brands dropped the show in the following few days, and Ingraham later apologized to Hogg on Twitter.

"I apologize for any upset or hurt my tweet caused him or any of the brave victims of Parkland," she wrote.

She continued: "For the record, I believe my show was the first to feature David immediately after that horrific shooting and even noted how 'poised' he was given the tragedy. As always, he's welcome to return to the show anytime for a productive discussion."

On Tuesday, Hogg launched a new boycott campaign on Twitter, calling out seven different companies that advertise on Ingraham's show, such as John Deere and SirusXM, and asking them to end their partnerships with Ingraham. The Fox News host compared the migrant child detention centers where children who have been separated from their parents are being held to "summer camps" during her show on Monday evening.

Here's how companies responded the last time Hogg staged a campaign against Ingraham's show: