"I don't know the status, but I will certainly look into it," she said.
“I am running for the president as a Democrat," the Vermont Independent said.
The crowd booed during the exchange as Clinton and Sanders shouted over each other.
She called Sanders a "self-proclaimed gate-keeper for progressivism."
"I'm not making promises that I cannot keep," Clinton said.
The debate comes just days before New Hampshire's primary on Tuesday.
Clinton announced a total of $15 million, short of Sanders's $20 million.
Hillary Clinton bested Bernie Sanders by a razor-thin margin.
Richard Harpootlian on Wednesday endorsed Sen. Bernie Sanders (I-Vt.) for president.
Sanders stopped mid-sentence and rushed over.