It was recently reported that Dutch intelligence hacked the “Cozy Bear” hacking group (reportedly Russian intelligence FSB) and observed their hacking activities, including their hack of the US Dept. of State, White House, and DNC. They even hacked a security camera so they could capture video evidence of everyone involved. They shared this information with the FBI over the course of years, assisting in the mitigation of some of the attacks. Bloomberg
As early as August 2016 (Source), Donald Trump received briefings on top secret intelligence, which presumably included information about the ongoing Russian attacks. Further still, Trump received a briefing on the Steele Dossier in early January 2017, before his inauguration. Source It seems virtually certain that during his entire presidency, Trump has been aware of this intelligence coming from Netherlands, which includes apparently irrefutable, hard evidence gathered real-time.
Yet Trump still continues to deny that there’s any evidence, and says he believes Putin that Russia wasn’t involved in any hack of the DNC or other interference in the US election. It’s not just a case of Trump doubting second-hand info and circumstantial evidence because it would tarnish his image of his victory. He’s specifically aware of top secret hard evidence, and still denies it to the public. It’s well-known that Trump lies a lot, but this seems like a more serious lie. He’s using his alleged doubts to delay his actions on sanctions against Russia, and he’s not taking action to strengthen US defenses against further hacks. He’s intentionally leaving the US vulnerable to attacks he conclusively and undeniably knows are happening.