Minnesota Senate Majority Leader Amy Koch resigned from her leadership post the day after four senior Senators confronted her about allegations that she had an "inappropriate relationship" with a staffer, senators said Friday.

Deputy Majority Leader Geoff Michel said he and other senators had first heard complaints from staff about the relationship about two weeks ago. Michel did not name the staffer with whom Koch was said to have the relationship but said the staffer was male and a "direct report."

Koch suddenly resigned from the majority leader post Thursday and said she would not run for re-election next year.

Michel and other senators would not say whether Koch should be brought up on ethics charges or whether it is appropriate for her to remain in the Senate.

Sens. Claire Robling, Chris Gerlach, David Hann and Michel were in the "long and tough conversation" with Koch on Wednesday.

On Friday, Dave Senjem, Gerlach, Hann and Michel met with the press to confirm the Wednesday conversation with Koch. They said that during that conversation, Koch brought up resigning from her post but they were still shocked when she did so suddenly on Thursday.