Ohio Republican Gov. John Kasich's chief political strategist has a message for President Donald Trump: "Be careful what you wish for." Earlier, a Fox News interviewer asked the president about the possibility of Kasich or retiring Sen. Jeff Flake, R-Ariz., running against him in 2020, and Trump responded, "I hope so." John Weaver, the Kasich strategist, responded to the remark with a warning. "Be careful what you wish for," Weaver said in a message to CNBC.