interfered upon his behalf in the election. Nor would it have been a crime if Trump &/or others in his campaign had colluded to maximize Russia's effectiveness in helping Trump's campaign as long as they were not colluding to do something illegal.
http://www.nationalreview.com/article/453264/donald-trump-george-papadopoulos-indictment-exculpatory-trump
"The term “collusion” can have a dark connotation, but it really only means some kind of concerted activity — not necessarily illegal. Prosecutors don’t care about collusion; they care about conspiracy — an agreement by two or more people to commit a violation of a criminal statute. That is, even if there is some concerted activity, collusion is not a crime unless the Trump campaign conspired with the Putin regime to do something federal law makes a crime — for example, to hack communications systems. If Trump officials and associates did not do this, then their activities may be unsavory, but they are not criminal."