station in london. friendly fire in the democratic party. the self-described socialist who ousted longtime congressman joe crowley in a shocking defeat is now trying to take down other democratic party icons. hello and welcome to "fox news @ night." i'm shannon bream in washington. sparks flew today in congress as a public hearing with the embattled fbi agent who sent anti-trump text messages tumbled into a heated political free-for-all. g.o.p. lawmakers threatening contempt when strzok refused to answer questions on the russia probe. we begin with chief intelligence correspondent catherine herridge who was on all day. good evening. >> agent strzok testified that the hearing is another victory for the russian president others wanted who want to tear america apart. he also acknowledges text messages were used to attack the fbi's integrity. >> the nothing but the truth so help you god. >> fbi agent peter strzok syllabi president trump as the poster child for clinical bias