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Over on Fox News Sunday, meanwhile, Newt Gingrich has said Trump’s criticism of judge Gonzalo Curiel is “inexcusable” and one of his “worst mistakes”, but declined to accuse the nominee of racism. Like Mitch McConnell on NBC earlier, he isn’t going to go quite that far.

Newt Gingrich. Photograph: Joshua Roberts/Reuters

Gingrich also said Trump had to recognize that he is now the “potential leader” of the US, and should thus up his game. This is perhaps an exclusive look at the kind of vice-presidential advice the former House speaker might give should Trump take him into the White House.

Though the Trump campaign has reportedly been narrowing its list of potential VPs – and though we don’t know if Gingrich is still on it, or ever was – he does at least fit the profile of such an appointment as outlined by campaign chair Paul Manafort this week: he’s white and male. Anything else would be “viewed as pandering”, according to Manafort.

Fox News Sunday also spoke to Clinton campaign chair (and sometime Guardian contributor) John Podesta, about his candidate’s move on to the offensive this week. And he said: “I think the card we’re going to play against Trump is that he has always been for himself.

“He’s a self-aggrandiser at the expense of literally thousands of people. And when it comes to Trump University what we learned this week was even his own employees called it a fraudulent scheme.”