UPDATE: At 6:45 p.m., Nelson said:

"Sexual harassment is never acceptable. I agree with a majority of the Democratic senators that Sen. Franken should step aside."

WASHINGTON – A majority of Democratic Senators — including Chuck Schumer — today called for Al Franken to resign but Florida's Bill Nelson is not yet among them.

Nelson's office hasn't responded to multiple questions about his stance.

When the allegations first surfaced, Nelson told us, "Sexual harassment is never acceptable. The Senate Ethics committee will fully investigate this troubling incident, as I believe they should."

Franken was to appear at a fundraiser for Nelson, at Alex Sink's Tampa-area home, but then canceled.