European Council president Donald Tusk has said a Polish military investigation that the probe is part of a smear campaign organised by his political opponents
Prosecutors are investigating former intelligence heads accused of acting with the prime minister’s approval during Tusk’s tenure in that job
Jaroslaw Kaczynski, leader of ruling Law and Justice Party (PiS), has brought prosecutors under the conservative government’s control.
He says Tusk may face charges over the 2010 plane crash that killed his brother Lech, who was Polish president at the time
Poland voted against Tusk being reappointed as head of the European Council back in March, but unanimity is not required
The other 27 EU governments supported a second term for Tusk