WASHINGTON—President Trump announced a 30-day ban on Europeans traveling into the U.S. and said he would take emergency action to offer financial assistance to those affected by the coronavirus pandemic in an effort to mitigate the impact of the virus that is rapidly spreading across the country and around the world.

Mr. Trump, in a national address from the Oval Office on Wednesday, said the travel suspension would begin Friday at midnight and would exclude the U.K. The president suggested the restrictions would apply to…

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