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As per Wikipedia:

On Poppy Harlow:

"In 2013, while reporting on the conviction of two Steubenville, Ohio, high school football players for the rape of a 16-year-old, [Poppy] Harlow stated that it was "incredibly difficult, even for an outsider like me, to watch what happened as these two young men that had such promising futures, star football players, very good students, literally watched as they believed their lives fell apart ... [Ma'lik Richmond] collapsed [and told his attorney,] 'My life is over. No one is going to want me now.'" This apparent expression of sympathy for the rapists provoked widespread criticism. A petition requesting that CNN apologize on the air for sympathizing with the Steubenville rapists received over 250,000 signatures within two days of CNN's report.[11]"

On Kaitlan Collins:

"While she was still with The Daily Caller, [Kaitlan] Collins was invited to make several appearances on CNN. At a White House correspondent event in spring 2017, she met network president Jeff Zucker and thanked him for having her on despite the ideological nature of her current employer. Collins was subsequently interviewed and hired to join the White House team at CNN in July 2017. She traveled with President Trump to at least half a dozen countries.
On Wednesday, July 25, 2018, Collins attended a photo op in the Oval Office as the day's pool reporter. As the event concluded, Collins asked Trump a series of questions about Vladimir Putin and Trump's former attorney Michael Cohen. Trump ignored her questions. Collins was subsequently barred from a Trump administration press conference in the White House Rose Garden that afternoon and was told by senior White House officials that such questions were "inappropriate for that venue." Trump's press secretary Sarah Sanders asserted that Collins had "shouted questions and refused to leave," while Trump's advisor Kellyanne Conway said that the action was about "being polite." Trump's deputy chief of staff for communications, Bill Shine, objected to the characterization of the White House's action as a "ban" but "declined to tell reporters what word he would use to characterize the White House’s decision to block her from attending the event." CNN stated that the Collins' ban was "retaliatory" and "not indicative of an open and free press." The White House Correspondents Association called the ban "wholly inappropriate, wrong-headed, and weak." Jay Wallace, president of Fox News, issued a statement in support of Collins, saying that his organization "[stood] in strong solidarity with CNN for the right to full access for our journalists as part of a free and unfettered press."