Should you bring your lawyer to the immigration interview?

Yes its more advisable. Treatment will be much better by the USCIS officer and also you will be well prepared. Else without the attorney it will be just you and the Immigration officer - mostly the interview is not recorded. No witnesses. Any mistranslation,misunderstanding or any think improper happens it will go against you. An experienced attorney should help you prepare well and also go through the interview properly.