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US Democrats have opened a formal impeachment inquiry into President Donald Trump over allegations he sought help from a foreign power to damage a political rival. Top Democrat Nancy Pelosi said the president "must be held accountable".

MPs and peers will return to Parliament later after the Supreme Court ruled that its suspension was unlawful. Boris Johnson, who is flying back early from a UN summit in New York, faces calls to resign from opposition groups.

The Nigerian authorities have charged a political activist with money laundering and insulting the president. Omoyele Sowore was arrested last month after organising street protests.