President Donald J. Trump campaigned on the notion of a new deal, as it were, for the American worker.

So why is the American worker under siege three weeks into his presidency?

He has threatened to impose a 20-percent tariff on Mexican imports, which would no doubt ensure tariffs on American exports to Mexico like corn and soy.

He has instigated a ban on seven Muslim countries – a ban whose stay the Ninth Circuit Court of Appeals has just upheld – which would threaten American universities and a tech industry that relies on the best and the brightest worldwide.

And he has shamed a major retailer, Nordstrom, for dropping daughter Ivanka’s line – Neiman Marcus has dropped her jewelry – thereby giving pause to those who would do business with and in America. ...