Karl Rove offered Democratic vice-presidential candidate Tim Walz some interview tips during a segment on Fox News Channel—and made a surprising case for the Minnesota governor and his running mate Vice President Kamala Harris in the process.

During the Friday segment, Fox News anchor John Roberts played a clip of ABC’s Michael Strahan asking Walz what he would say to people who don’t trust the Minnesota governor given his past misstatements.

Walz replied, “I know that things get spun in a political environment. But I think what........

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