The 95-year-old husband of Britain's Queen Elizabeth II will cease royal duties from autumn.
May said "threats against Britain" were "deliberately timed to affect the result of the general election."
The approval gives Prime Minister Theresa May the power to start the formal process of leaving the European Union.
Queen Elizabeth has been caught on camera saying Chinese officials were "very rude" to the British ambassador during Chinese President Xi Jinping's visit to Britain last year.
British Prime Minister David Cameron will host an international anti-corruption summit aimed at stepping up global action to combat corruption in all walks of life.
US President Barack Obama calls on UK voters not to ditch European Union membership in June 23 referendum to continue to make bloc stronger
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