Because the first round of indictments against Russians in the election rigging scandal didn't explicitly state that the outcome of the election was altered nor that they collaborated with any of the people around Trump, he took to Twitter to claim that he had been cleared of suspicion and that we're done. Nothing to see here. His exact choice of words was "case closed".
That is, of course, not the case. There's plenty to see here, and a lot more is coming very soon. Robert Mueller and his team are going to make Trump eat those words.
Dtarting today, I'm having the popcorn ready.