Wall Street falls the most since Oct as Trump honeymoon sours on Protectionism

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"Investors focused on the pro-growth of (Trump's) proposals and not those detrimental to economic activity, like protectionism," said Peter Cardillo, chief market economist at First Standard Financial in New York.

He said investors wore blinders to only see the market-friendly policies Trump spoke about during the campaign and the immigration ban was a reminder of actions he could take that could undermine the economy.