CONCORD, N.H. (AP) — Vermont Sen. Bernie Sanders says he doesn't understand why his Democratic rival Hillary Rodham Clinton hasn't taken a position on the sweeping trade deal the Obama administration is negotiating with Pacific nations.

A day after launching his presidential campaign, Sanders returned to New Hampshire, where a blunt voter, Jeanny Aldrich, told him she doesn't want Sanders merely to siphon votes from Clinton. Aldrich wants him to give the Clinton campaign a thrashing.

Sanders replied that he's never run a negative campaign and won't start now. But he says the campaign should feature civil debate on serious issues, like the Trans-Pacific Partnership trade deal he opposes. Clinton, who launched her presidential campaign in April, has expressed qualms about the agreement without weighing in for or against it.