The post in question that Twitter deemed 'potentially misleading' and requiring fact-checking is related to mail-in voting which the president believes is fraught with forgeries, fraud and other manipulations.
Trump reiterated his stance in a later post, vowing to strongly regulate or even close down social media, intolerant to conservative points of view, recalling similar attempts to stifle such opinions back in 2016.
It remains to be seen what measures he has in mind, but for now, Trump continues to stay loyal to his favourite platform.