Kristol, along with other conservative pundits, long has been working to attract an independent candidate to run in November amid lingering concerns in some wings of the Republican Party about Trump’s conservative credentials. This effort to date has struggled to recruit a willing candidate, while running into logistical hurdles — including the rules and deadlines for getting new names on the ballot.

Yet on Sunday, Kristol teased a forthcoming announcement, saying on Twitter:

Trump backer Ben Carson, spoke Monday on Fox News to discuss Bill Kristol.