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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".

The makers of US TV comedy South Park have issued a mock apology to China after the show was made largely unavailable in the country. In a recent episode, the character Randy is subjected to forced labour and Communist Party re-education after being jailed during a visit to China.

Tuberculosis is one of the world's biggest killers - in particular in combination with HIV. Together they are often called the twin epidemics. The Global Fund To Fight AIDS, TB, and Malaria is meeting in Lyon, France, this week.