The Czech Republic's Christian Democrats, the junior coalition partner, gained the most seats in Senate elections on Saturday, in a possible setback for Prime Minister Bohuslav Sobotka's Social Democratic party a year before a nationwide poll, Reuters writes.

The center-left ruling coalition, which includes the ANO movement that performed well in regional elections the previous weekend, maintained its majority in the upper house Senate in votes to contest a third of its seats.

Parliament's lower house is the country's main legislative body, and elections for its 200 seats are due in October 2017.

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