Sen. Al Franken plans to make an "announcement" Thursday as his Democratic colleagues urge him to resign.

Franken's office announced the event on Wednesday but did not immediately give any more details. Thursday's announcement will follow the latest in a string of sexual misconduct allegations against the Minnesota Democrat, which surfaced Wednesday.

Franken tweet

Earlier Wednesday, Politico reported that a former Democratic congressional aide is accusing the Minnesota Democrat of forcibly trying to kiss her 11 years ago. In a statement before the calls for his resignation started, Franken denied the accusation.

In a flurry of statements Wednesday, more than 20 Democratic senators called for Franken to step down. Female Democratic senators, including Kirsten Gillibrand of New York, Mazie Hirono of Hawaii and Claire McCaskill of Missouri, started the avalanche of calls for Franken to leave the Senate.