Haley Stevens’ staff has resigned following the Democratic lawmaker’s decision to jump ship and endorse Republican Mike Rogers for Senate.

Just hours after Rep. Stevens (D-Mich.) officially endorsed Republican Senate nominee Rogers on Sunday, Justin German, Stevens’ chief of staff, said he and many members of his team had resigned.

“As Haley Stevens’ chief of staff for eight years, I speak on behalf of our team in wholeheartedly supporting Abdul El-Sayed for Senate,” German said Sunday in a statement. “This election is too important to sow division or stand on the sidelines. We are shocked and heartbroken by Congresswoman Stevens’ decision to support Mike Rogers.”