"While I believe I have the authority to carry out this military action without specific Congressional authorisation, I know that the country will be stronger if we take this course and our actions will be even more effective," President Obama said.
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Ex-Spitfire pilot Allan Scott, 94, said he was told off by the Queen when he first met her in 1943 when she was just 16.
Last minute preparations are going on at the Church of St Mary Magdalene where Princess Charlotte will be christened.
Princess Charlotte is being christened on Sunday at Sandringham in Norfolk in only her second public appearance since she was born.