Donald Trump is being accused of playing politics by suggesting a coronavirus vaccine might be ready by next month, just ahead of the presidential election.
His rival Joe Biden says science should dictate when a vaccine is made available.
The pandemic is front and centre in the minds of voters.
And precautionary measures have also seen a more subdued start to the election campaign compared to 2016.

Al Jazeera’s Rosiland Jordan reports from Washington, DC.

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