One day after retaking a majority in the US House of Representatives, Republicans have said they will investigate the president's family as a "top priority".
The lawmakers said the inquiry would focus on overseas business dealings of the president's son, Hunter Biden.
The 52-year-old is already under federal investigation, but has so far not faced any charges.
The younger Biden is not involved with the administration in any capacity.
But top Republicans insist their inquiry will determine the extent of Joe Biden's alleged involvement in his son's business dealings, including during the elder Biden's time as vice-president.
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