Maine Sen. Susan Collins is criticizing the Trump administration for failing to mention Jews in a statement remembering the Holocaust.

Collins said over Twitter that “The administration’s omission of the Jewish people in a Holocaust remembrance statement is an historical mistake.”

Trump administration officials have defended their statement, saying that it appropriately recognized the horrors of the Holocaust, which killed millions of people in addition to Jews.

Spokesman Sean Spicer on Monday accused critics of nitpicking and noted that the statement was written with the help of a person who is both Jewish and the descendant of Holocaust survivors. Trump’s son-in-law Jared Kushner is both.

Nonetheless, critics have said that omitting specific reference to Jews or anti-Semitism can be a form of Holocaust denial.

The Nazis specifically set out to exterminate all the Jews of Europe.