However, despite its "legalistic" tone, the term collusion has no specific legal meaning in criminal law; there's no such criminal charge called "collusion," nor does the term necessarily signal a criminal offense.
That said, were it Hillary who had so many associates lying about their contacts with Russians, 'lock her up' would have been the most benign of chants. 'Hang her traitorous commie Putin loving ass' would have been the most popular refrain from the GOP.