A fundraiser for Rep. Adam Kinzinger, R-Ill., will be headlined by Karl Rove and co-hosted by a who’s who of Illinois Republicans, a show of political strength coming as ex-President Donald Trump vows revenge against GOP House members who voted to impeach him. The co-hosts — there are more than 150 on the invitation obtained by the Chicago Sun-Times — include two high-ranking Trump appointees from Illinois: Ron Gidwitz, Trump’s former ambassador to Belgium and acting ambassador to the European Union, and Barbara Stewart, the ex-chief executive officer of AmeriCorps. Kinzinger is one of 10 Republicans to vote with House...