US House of Representatives Speaker Paul Ryan will not run for re-election this year, in a big blow to Republicans with mid-term elections looming.
Congress' most powerful lawmaker said he would not stand for another term in his Wisconsin district this November. Republicans already face a tough challenge from Democrats to keep control of the lower chamber.
Mr Ryan joins nearly 30 House Republicans who have announced this year they are retiring outright. Democrats need 23 seats to take over the House.
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