News outlets tend to focus on new material. While some outlets may be inclined to fact-check a false Trump claim the first, second, third or even 10th time he utters it, they are far less likely to devote precious resources to a claim on the 100th or 150th utterance – especially because he is constantly mixing in dozens of new lies that require time and resources to address. And so, by virtue of shameless perseverance, Trump often manages to outlast most of the media’s willingness to correct any particular falsehood, eventually getting that claim into news coverage and social media clips nearly uncorrected.
(intentionally posting this on both the politics and media threads)