slamming trump for refusing to release his taxes. >> maybe i'm going to do the tax returns when obama does his birth certificate. >> the state of hawaii released my official certificate. >> if i decide to run for office, i'll produce my tax returns, absolutely. >> i am officially running for president of the united states. >> so kristen, at the same time hillary clinton is trying to focus on donald trump, she's still got a fight in this primary. she's in kentucky today. she can't afford to suffer an embarrassing loss there. >> reporter: you're absolutely right, willie. secretary clinton's biggest challenge right now is trying to figure out how to allocate her resources, her time, her money. she's spending big money in kentucky because she doesn't want to lose there. now, tough to poll in that state. we think she probably had a slight lead. the campaign is going to aggressively go after new jersey and california as well. she wants to turn it around a little bit after a slew of losses...
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