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The White House has officially refused to co-operate with the impeachment inquiry against President Donald Trump. A letter sent to Democratic leaders rejected it as "baseless" and "constitutionally invalid".

Turkey has boosted its military positions on the border with Syria after saying it is ready for a long-threatened operation that could target Kurdish forces long allied to the US.

West African politicians and film stars are among thousands calling for action following a ´óÏó´«Ã½ report into sexual harassment at top universities.