Rep. Tim Ryan, D-Ohio, announced Thursday that he would run against Rep. Nancy Pelosi, D-Calif., to lead Democrats in the House next year.

His announcement sets up an immediate battle among Democrats, some of whom who were bitterly disappointed with last week’s election results and could support a changing of the guard. But Pelosi, the current minority leader, has said she already has the support of two-thirds of House Democrats, and that she hopes to be the minority leader again in the new Congress.