WASHINGTON—Former Vice President Joe Biden’s lead over President Trump reached double-digits this month as Mr. Trump’s approval rating declined amid widespread disagreement with his handling of the coronavirus pandemic, according to a new Wall Street Journal/NBC News poll.

Less than four months before the November election, 51% of voters said they would vote for Mr. Biden if the election were held today, with 40% backing Mr. Trump. Mr. Biden’s lead over the president rose to 11 percentage points from 7 percentage points last…

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