Exchange of fiery words by Biden, Trump over masks

The Democratic presidential candidate, out for the first time since March, was seen in a face mask; the president called Biden's decision "unusual."
2:16 | 05/27/20

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Transcript for Exchange of fiery words by Biden, Trump over masks
Tom, thank you. Amid all of those, a new war of words erupting between president trump and Joe Biden. President trump taking aim at Biden for wearing a mask on memorial day. Biden saying the president is an absolute fool to talk that way. Here's Mary Bruce. Reporter: Tonight, two images reflect the split screen this campaign has become. President trump in a factory without a mask, surrounded by people who are all wearing them. And his rival Joe Biden, out for the first time publicly since March. His own face, covered. He was standing outside with his wife, perfect conditions. Perfect weather. They are inside, they don't wear masks and so I thought it was very unusual that he had one on. Reporter: Biden tonight firing right back. He's a fool. An absolute fool to talk that way. I mean, every leading doc in the world is saying we should wear a mask when you're in a crowd. This macho stuff for a guy, well, I shouldn't get going. But it just has cost people's lives. Do you think wearing a mask reflects strength or weakness? Leadership. What is projects is leadership. Reporter: The two candidates in stark contrast. President trump pushing to reopen, and is now threatening to rip the Republican convention away from North Carolina unless the state will allow a packed house. But today governor Roy cooper, I will say that it's okay for political conventions to be political. But pandemic response cannot be. Reporter: The president is blaming the governor, not the virus, for why the convention might not go on as planned. We have a governor who doesn't want to open up the state. Reporter: But the governor says his decision will be guided by health and safety concerns. Noting that other large organizations like NASCAR have put together a plan to reopen safely and now it's the RNC's turn. And now the Republican governors of Florida and Georgia are raising their hands to host the convention instead. While Democrats are taking the opposite approach. They're already planning to massively scale back their convention. Possibly holding much it virtually. Mary, thank you. Next to the horror unfolding

This transcript has been automatically generated and may not be 100% accurate.

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