Richardson was a favourite to win the gold medal in the 100m sprint.
McLaughlin is the first woman to run the event in under 52 seconds.
Berry said she feels the timing of the anthem was a deliberate "set-up".
Manuel is the current reigning Olympic champion for the women's 100m freestyle.
Houlihan was expected to be a contender for a medal in the 1500m at Tokyo.
Taylor won gold medals at the Olympics in 2012 and 2016.
"We need to be flexible," said Nadal.
The organizers of the 2020 Tokyo Olympics have revealed that the event will now take place in 2021, retaining the same time...