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The US House of Representatives will open a formal impeachment inquiry into President Joe Biden, its most senior Republican has said. Kevin McCarthy said the inquiry would focus on "allegations of abuse of power, obstruction and corruption" by Mr Biden. Republicans have been investigating the president since they took control of the House in January. The hearings have found no concrete evidence of misconduct by Mr Biden. They have, however, shed more light on business dealings by the president's son Hunter Biden - which Republicans say are questionable - and on Mr Biden's knowledge of his son's activities.