That is ridiculous. By itself, the June 9, 2016 meeting at Trump Tower between Donald Trump Jr., Paul Manafort and Jared Kushner with Natalia Veselnitskaya and several other Russian operatives justified an investigation of collusion between the 2016 Trump Campaign and the Russian government. Donald Trump Jr. made several misleading statements about this meeting. He initially told the press that the meeting was held to discuss adoptions of Russian children by Americans. On July 8, 2017, after news reports stated that Trump Jr. knew the meeting was political, he admitted in a tweet that he had agreed to the meeting with the understanding that he would receive information damaging to Hillary Clinton.
Furthermore, when the New York Times was about to report on email exchanges between Rob Goldstone (who arranged the meeting) and Trump Jr., Trump Jr. himself admitted that Goldstone had stated in an email to him that the Russian government was involved and that the purpose of the meeting was to get "dirt on Clinton" and that the meeting concerned a "Russian effort to aid the Trump campaign". In early July 2017, it was reported that President Donald Trump himself drafted Trump Jr.'s initial misleading statement while aboard Air Force One. This report was later confirmed by the president's attorneys. In July 2018, the President denied knowledge of the meeting.
For the whole thing to have been "nonsense", President Donald Trump and Donald Trump Jr. sure were trying to cover something up with a lot of lies. An investigation was more than warranted and the cable news networks, CNN included, would have been derelict not to cover such an investigation.
Any comparisons between OANN and CNN's coverage of the Mueller investigation and allegations of collusion between the 2016 Trump campaign and the Russian government can easily be dismissed as partisan deflection. The fact is, the June 9, 2016 Trump Tower meeting did take place... and President Trump and his oldest son were caught in multiple lies over the matter. Why lie so many times if you have nothing to hide?