EU's Donald Tusk questioned in Polish investigation
European Council president Donald Tusk has said the case in which he was questioned as a witness in Poland is of "highly political character".
Mr Tusk spent more than eight hours behind closed doors on Wednesday responding to questions by military prosecutors.
The investigation deals with alleged secret illegal contacts between Polish and Russian intelligence officials at a time when Mr Tusk was Poland's prime minister.
Mr Tusk told reporters as he left the prosecutors' office that he cannot give details of the questioning, which is secret, but that he was treated hospitably.
"The whole case has a highly political character," Mr Tusk said.
He is not a suspect, but only a witness in the investigation.
The alleged illegal activity took place during his 2007-2014 tenure as prime minister.
Many see his questioning as part of a larger attempt by Poland's nationalist government to discredit a political foe by linking him to scandals.
With backing for Mr Tusk still strong in the country, he could prove to be a serious rival to the ruling party in the 2019 parliamentary election and in the 2020 presidential election.
Mr Tusk has also been accused by defence minister Antoni Macierewicz of treason in another matter, the handling of the aftermath of the 2010 plane crash in Smolensk, Russia, that killed Polish president Lech Kaczynski.
An agitated crowd of both faithful supporters and angry opponents greeted him when he arrived at Warsaw's main train station on Wednesday morning to testify.
Mr Tusk's supporters carried EU and national flags and chanted: "Donald, we are with you!"
Opponents hurled accusations of crimes and of Mr Tusk having hurt Poland's interests.
One detractor raised a large mock-up photo depicting him in striped prison garb.
In the current case, prosecutors have not revealed details of the alleged illegal contacts, but they are investigating whether the heads of Poland's intelligence neglected their obligation to seek Mr Tusk's approval for co-operating with foreign intelligence agencies.
Polish media reports say the deal was aimed at allowing Polish investigators probing the president's plane crash to operate on Russian soil.
"I have no reservations as to the work of the (special) services," Mr Tusk said before his meeting with prosecutors.
Poland's current ruling conservative party, Law and Justice, is led by the late president's twin brother, Jaroslaw Kaczynski, a nationalist politician who is a long-term political rival of Mr Tusk's.
Mr Kaczynski and others accuse Mr Tusk of failing to oversee proper security for the presidential flight.
They also fault Mr Tusk for letting the Russians carry out the main investigation and for failing to get the wreckage back.
Mr Kaczynski drove the failed effort last month to block Mr Tusk from getting a second term as head of the European Council.
Only Poland opposed Mr Tusk's re-election, which was approved by the 27 other EU members.