The Czech leader been under increased pressure this week after his son told an online news portal he was deliberately kept in Crimea to avoid being questioned in the case. Babis denies that, saying his son — who lives in Switzerland and is mentally ill — was there voluntarily.
More protests are scheduled for Saturday. Babis' coalition government will face a confidence vote in Parliament's lower house over the scandal. Parliament's upper house on Thursday asked Babis to step down until the investigation is completed.