WASHINGTON — A half dozen Senate Democratic women called for Senator Al Franken to resign Tuesday as a sixth woman came forward to charge that the Minnesota Democrat had made an improper advance on her.

“Enough is enough,” declared Senator Kirsten Gillibrand of New York.

She was joined by Mazie Hirono of Hawaii, Claire McCaskill of Missouri, Patty Murray of Washington, Kamala Harris of California and Maggie Hassan of New Hampshire, who issued statements in a coordinated effort that is likely to jeopardize Mr. Franken’s political future.

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“As elected officials, we should be held to the highest standards — not the lowest,” Ms. Gillibrand wrote on Facebook . “The allegations against Sen. Franken describe behavior that cannot be tolerated. While he’s entitled to an Ethics Committee hearing, I believe he should step aside to let someone else serve.”

Mr. Franken, a Democrat of Minnesota, has apologized for his behavior, but the senators said his admissions are not enough.

“I have been shocked and disappointed to learn over the last few weeks that a colleague I am fond of personally has engaged in behavior toward women that is unacceptable,” Ms. Gillibrand said. “I consider Senator Franken to be a friend and have enjoyed working with him in the Senate in our shared fight to help American families. But this moment of reckoning about our friends and colleagues who have been accused of sexual misconduct is necessary, and it is painful. We must not lose sight that this watershed moment is bigger than any one industry, any one party, or any one person.”

That was followed in rapid succession with other statements.

It is clear that Al Franken has engaged in a pattern of egregious and unacceptable behavior toward women. He should resign. Sen. Maggie Hassan (@SenatorHassan) December 6, 2017