"When did 'Concerns' become 'evidence of a crime'?"
when they were taken before the FISA court and before the grand juries and, as a result, resulted in warrants. Duh, what a silly question.
Dude, have you even been paying attention?
You just said there were 'concerns', not 'evidence'. You have no idea what was presented in this SECRET tribunal (how convenient), and in the end the wire-tap was ended due, reportedly, due to a 'LACK OF EVIDENCE', which means it was proven never to have been anything more than a 'concern' that panned out into NOTHING.
NO EVIDENCE of a CRIME.
NO EVIDENCE of Trump involvement in this NON-existent Crime.
The fishing expedition and justifications for the false / un-substantiated accusations continue.