Russia has already admitted to interfering in some other countries elections by stating it wouldn't do so again. Other countries have found evidence of Putin interfering  pin their elections. Of course Russia interfered in our election. I hope the investigation can find evidence that Trump and his campaign knew and/ or colluded with Russia, as well know they did. 
Trump is just digging the hole deeper.  The spin of "I'm seeking immunity because this is a witch hunt" falls flat.  Flynn has something to hide and Trump knows it.