Egypt's Muslim Brotherhood has called on President Mursi's supporters to take to the streets of Cairo on Tuesday.
Protests against Mursi's decision to assume sweeping powers in the country were already planned in the capital for the same day.
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The Duke and Duchess of Cambridge met young people who have battled mental health issues on Saturday.
Former Chancellor Lord Geoffrey Howe was Margaret Thatcher's longest-serving Cabinet minister, also taking on the role of Foreign Secretary.
Lord Geoffrey Howe is known by many for his resignation speech which was seen as the catalyst which destroyed Margaret Thatcher.