Although European Council president Donald Tusk only appeared in court as a witness, some officials who served under him when he was prime minister of Poland in 2010 are being sued for not ensuring the safety of President Lech Kaczynski's plane.
The EU president says Polish intelligence probe is a part of "smear campaign".
Jaroslaw Kaczynski blames European Council president Donald Tusk over Polish president's plane crash in 2010
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