US President Donald Trump has honoured Charlie Kirk's life with his widow Erika. Photo: AP PHOTO

US President Donald Trump has hailed slain conservative activist Charlie Kirk as a "martyr for American freedom" and vowed at his memorial service to carry on his work, while again accusing what he called the "radical left" for Kirk's murder.

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The memorial, organised by Kirk's conservative youth advocacy organisation Turning Point USA, drew tens of thousands of mourners dressed in red, white and blue who filled State Farm Stadium in Glendale, Arizona.

Trump said the 31-year-old was targe

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