Sure, but a crime is a crime, it does not matter when it occurred. That is how investigations work, you investigate, you find evidence, you prosecute. Even if this does not have anything to do with Russian election meddling or Trump working with Russians, it is still a crime. Even if they do not find any evidence of Trump breaking any laws, I expect everyone who worked with him on his campaign, if they broke any laws to pay for those crimes. These type of investigations should be done on all politicians, the corruption in the US government needs to stop. Not only that I think we should have laws that prevent anyone from donating/funding politicians and all elections should be publicly funded with a fixed amount of money for each politician.