German Chancellor Angela Merkel quickly hit back at efforts to block Polish ex-premier Tusk, saying he had wide support and that giving him a second term would be a "sign of stability".
The right-wing Polish government's efforts to oust Tusk, its long term domestic political foe, threaten to open up a major east-west split in the European Union just as it tries to focus on unity ahead of its 60th birthday.
"We will inform our (EU) partners that the entire summit is at risk if they force the vote (on Tusk) today," Polish Foreign Minister Witold Waszczykowski told local television.
Polish officials said Prime Minister Beata Szydlo could veto the conclusions of the summit, thus torpedoing Tusk's re-election for now, or could insist on a unanimous vote, he said.
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But European diplomats insist that Poland has no veto and that Tusk can be re-elected by a qualified majority, adding that they do not want to be strong-armed by a Polish domestic wrangle.
The row is overshadowing talks on the economy, defence, and unrest in the Balkans on Thursday, and then on Friday, without British Prime Minister Theresa May, on preparations for a summit in Rome on March 25th to mark the 60th anniversary of the EU's founding treaty.
"I see his reelection as a sign of stability for all of Europe, and I am happy to continue working with him," Merkel told the German parliament before heading to the summit in Brussels.
Leaders had hoped to rubberstamp Tusk's new term, which would run from May until November 2019, but Poland put forward a surprise rival candidate, euro-MP Jacek Saryusz-Wolski.
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