WASHINGTON – Several senators including Claire McCaskill are calling on fellow Democratic Sen. Al Franken to resign amid sexual harassment allegations. Franken's office announced he will make an announcement on Thursday.

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Sen. Kirsten Gillibrand wrote on Facebook that while Franken is entitled to have the Ethics Committee conclude its review, "I believe it would be better for our country if he sent a clear message that any kind of mistreatment of women in our society isn't acceptable by stepping aside to let someone else serve."

Senators Mazie Hirono of Hawaii, Maggie Hassan of New Hampshire, Patty Murray of Washington state joined Gillibrand in pressing for Franken to quit.

The Associated Press contributed to this report.