Prague - Czechs began voting Friday in Senate run-off elections that have become a key test for Czech Prime Minister Mirek Topolanek ahead of his country's EU presidency in the first half of next year.
The run-offs came a week after Topolanek's senior ruling Civic Democrats lost a regional election to their arch-rivals, the main opposition Social Democratic Party.
The weakened premier hoped to mitigate the defeat in the run-offs ending Saturday.
To focus on political hurdles at home, Topolanek, one of the most pro-US leaders in eastern Europe, decided to cancel next week's US trip, including a White House visit with US President George W Bush, his spokeswoman said.