IAAF president Lord Coe says he is "not in the mood to gag the voices" of athletes should any protest at the 2019 World Championships in Doha.
World record holder Genzebe Dibaba - one of Briton Laura Muir's main rivals in the 1500m - pulls out of the World Championships with a foot injury.
Follow live coverage of the 2019 World Athletics Championships in Doha across BBC TV, radio, online, mobile app and BBC iPlayer.
Double Paralympic champion Libby Clegg is named in Britain's squad for the World Para Athletics Championships five months after becoming a mother.
Audio & Video
Great Britain's Daryll Neita wins the women's 100m race in 11.29 seconds with American Morolake Akinosun in second and Imani Lansiquot of Great Britain & Northern Ireland third.
British heptathlete Katarina Johnson-Thompson discusses the sacrifices she is making to prepare for this year's World Championships.
Before Dina Asher-Smith, Jodie Williams was the Briton expected to be the next big thing in women's sprinting, but injuries intervened - now based in Phoenix, she is ready to rise again.
How to get into athletics
It has one of the widest ranges of choice in sport, from jumps and throws to sprints or distance and cross country running.
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