Poland is among the Eastern European countries to have opposed a European Union plan adopted in 2015 to take in 160,000 Syrian, Eritrean and Iraq asylum seekers from overstretched Greece and Italy.
Yesterday, the EU set a June deadline for Poland and Hungary to start admitting their share of migrants or risk sanctions.
"With the help of Europe do we want to resolve the immigration problems, namely defend borders but also help the states who are welcoming too many refugees? Or instead do we harshly reject European solidarity and not welcome them, as the (Polish) government proposes today?" Tusk asked reporters in Strasbourg.
Tusk has strained relations with governing conservative Law and Justice (PiS) party in Poland, which was the only member state to oppose his reelection as EU president in March.
PiS leader Jaroslaw Kaczynski has also accused him of "moral responsibility" for the death of his twin brother, the late president Lech Kaczynski, in a 2010 air crash in Russia that also killed 95 others. Tusk was prime minister at the time.
But the PiS launched a fresh probe and a commission of enquiry suggested last month that an explosion likely caused the aircraft to break up in mid-air.
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