Northwestern head coach Chris Collins argues a call with the referee during senior day in the first half against Iowa at Carver-Hawkeye Arena in Iowa City on Saturday, March 7, 2015. The Hawkeyes (22-10, 13-6) beat the Wildcats (15-17, 6-13) 69-52 to win their 6th straight. (Justin Torner/Freelance for the Press-Citizen)