Although, I do think they should find something that Obama did not do first. If Obama was given a pass on campaign finance violations, and Trump is not, whataboutism would be a legitimate defense, so I think that would be a tactical mistake on their part. They need to find something else, like perjury, then they should go for it if they want. It worked out well for the GOP, after all.
Trump would be a fool to talk to the FBI in person, though. It would be an automatic lying to the FBI charge, even if he only read from the bible during the interview. But, if they can get him on the stand in someone else's case....
Interestingly, none of this justifies the use of foreign intelligence assets to spy on a political campaign. I imagine that you will scream loudly when Trump does that to them.