US President Donald Trump's 14-year-old son, Barron, tested positive for Covid-19 but exhibited no symptoms after both of his parents contracted the virus, US first lady Melania Trump said on Wednesday.

"Luckily, he is a strong teenager and exhibited no symptoms," said Melania in a statement. She said she and Barron had since tested negative for the virus.

Donald told a rally in Des Moines, Iowa, that Barron "is just fine now" and said it was an example of why schools...