Clinton spokesman Brian Fallon says the Clinton campaign has offered three different dates to debate Sanders in New York. Sanders is pressing for a debate before the state's April 19 primary.
Clinton's team says the Sanders camp has rejected debate offers for April 4, April 14 and April 15.
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Fallon says the Sanders campaign should stop using the New York primary as a "playground for political games and negative attacks."
The Democrats last debated in March and have been negotiating two more debates in April and May.