Kelsi Dahlia earns a second swim and will be the top seed in the semi-finals of the 100 butterfly after posting the fastest time of the day with a 56.56 at the US Olympic Trials in Omaha! 🇺🇸 🦋👑 #CardinalsFly x #SwimTrials21 x #GoCards t.co/Zj6fKAOjXX