EXCLUSIVE — As Kamala Harris steamrolls her way toward the Democratic nomination, Republicans are now shifting their attacks to tie vulnerable Democrats to some of the vice president’s most unpopular policy stances.

In a new ad being debuted by the National Republican Congressional Committee on Thursday, House Republicans are tying their Democratic opponents to Harris as they seek to paint the vice president as an “extreme” candidate. The ad comes as Republicans race to define Harris as a challenger just days after President Joe Biden withdrew from the race.