Donald Trump fired back at Karl Rove on Tuesday for labeling his possible White House bid a “joke,” saying the one-time senior adviser to President George W. Bush “should be ashamed of himself” for the role he played in pushing an agenda that turned voters against Republicans and paved the way for the Obama presidency. Mr. Trump, the billionaire real estate developer and reality-TV-show star still weighing a 2012 race, said in an interview that the Republican brand was so tarnished after the Bush-Rove years that even “Abraham Lincoln couldn’t have beaten” President Obama in the 2008 presidential race. “Honestly,...