Venezuela's opposition leader Juan Guaidó calls for more protests

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The Venezuelan opposition leader Juan Guaidó has called for an escalating series of strikes as part of his campaign to oust President Nicolas Maduro. The US Attorney General William Barr has decided not to testify before the judiciary committee of the House of Representatives on Thursday. Caster Semenya has lost a landmark case against athletics' governing body meaning it will be allowed to restrict testosterone levels in female runners.