VIDEO: Queen greets President Obama on first UK state visit

The Queen has greeted US President Barack Obama, and his wife Michelle, at the start of his first UK state visit. The Obamas also met Prince Charles and the Duchess of Cornwall and spent 20 minutes with newlyweds the Duke and Duchess of Cambridge. They are due to lay a wreath on the Tomb of the Unknown Warrior in Westminster Abbey and attend a state banquet at Buckingham Palace. It comes after Mr Obama and David Cameron told of "essential" US-UK ties.

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