Foreign Secretary William Hague said he has became a supporter of gay marriage "over the last couple of years" and suggested the change would become quickly accepted by the public.
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In a searingly emotive address, the president cast Hillary Clinton as the most qualified candidate to unify America as next US president.
The release is the second batch in a series of leaks that have rattled the Democratic Party.
The rare 1901 edition of The Tale of Peter Rabbit will go under the hammer to mark the 150th anniversary of the author's birth.