German SPD leader Schulz promises higher taxes for the rich

Chancellor candidate Martin Schulz of the German Social Democratic Party speaks at his party's annual economy forum in Berlin, Germany, June 13, 2017. REUTERS/Axel Schmidt

BERLIN (Reuters) - Germany's Social Democrats (SPD) said on Monday they would tax the rich more and low earners less, making a play to win back working-class voters as the party seeks to revive a flagging election campaign.

SPD leader Martin Schulz hopes to unseat Chancellor Angela Merkel in the Sept. 24 election, but the centre-left party has lost momentum in the polls since making gains following his nomination in January.