Cruz win in Wisconsin leaves Trump a damaged front-runner

Republican Donald Trump has emerged from the Wisconsin primaries as a damaged front-runner following a crushing primary loss to rival Ted Cruz, deepening questions about the billionaire businessman's presidential qualifications and pushing the Republican Party toward a rare contested convention nomination fight.

Democrat Bernie Sanders also scored a sweeping victory on Tuesday giving him fresh incentive to keep challenging Hillary Clinton. But Mr Sanders still lags behind Mrs Clinton in the all-important delegate count.