US President Donald Trump has posthumously awarded America's highest civilian honour to Charlie Kirk , the assassinated activist who inspired a generation of young conservatives and helped push the nation's politics further to the right.

Receiving the award on Kirk's behalf was his widow, Erika. Her voice cracking and often falling to a whisper as she wiped away tears, Kirk talked about her late husband's life, political beliefs and legacy.

"Thank you, Mr President, for honouring my husband, in such a profound and meaningful way. And thank you for making this event a priority," she said.

"Your support of our family and the work that Charlie devoted his life to will be something I cherish forever."

The ceremony coincided with what would have been Kirk's 32nd birthday.

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