In a brief statement on Wednesday, Minority Leader Chuck Schumer of New York said: "I consider Senator Franken a dear friend and greatly respect his accomplishments, but he has a higher obligation to his constituents and the Senate, and he should step down immediately."
The statement came after a majority of Senate Democrats, led by female members, called for Franken to quit as a fresh accusation emerged about the senator.
Franken plans to make an announcement on Thursday.
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The top Senate Democrat says Sen. Al Franken should resign as allegations of sexual misconduct against the Minnesota lawmaker multiply.