Members of Donald Trump’s team are quietly preparing to go on offense against Robert F. Kennedy Jr. as internal campaign polling suggests his expected third party bid could draw more votes from Trump than President Joe Biden in a general election. Semafor has not independently reviewed the polling. One person close to Trump’s campaign said it showed that Kennedy took more votes from Trump than left-wing independent Cornel West drew from Biden when both were tested. “It’s single digits, but it’s enough where it counts to make a difference,” the person said. A second person familiar with the polling confirmed...