Polish Prime Minister Donald Tusk angrily demanded Wednesday that President Barack Obama explain his reference to "a Polish death camp" during a high-profile White House ceremony a day earlier, saying the remark smacked of "ignorance, lack of knowledge, bad intentions" and amounted to "a distortion of history." "When someone says 'Polish death camps,' it is as if there were no Nazis, no German responsibility, as if there was no Hitler—that is why our Polish sensitivity in these situations is so much more than just simply a feeling of national pride," the prime minister said. Tusk bluntly rejected National Security Council spokesman Tommy Vietor's expression of "regret" for the remarks and acknowledgment that Obama "misspoke" as falling woefully short of making up for the mistake. "I am convinced that today, our American friends are capable of a stronger reaction—a clearer one, and one which perhaps ...