US President Donald Trump celebrated the Jewish festival of Hanukkah on Wednesday with a controversial change to the definition of Judaism -- a move that will allow clamping down on boycotts of Israel.
"I will always stand with our treasured friend and ally the state of Israel," Trump told a gathering in the White House's ceremonial East Room.
Trump, who calls himself the most pro-Israeli US president in history, used the annual event to reinforce his determined effort to win over traditionally pro-Democratic American Jewish voters ahead of next year's presidential election.
Trump signed an executive order, which bypasses Congress, that essentially redefines Judaism as both a nationality as well as a religion.
The seemingly academic change will have the important legal effect of allowing the government to clamp down on a boycott movement spreading on university campuses against Israel over its treatment of Palestinians.
Trump said the order was to "combat anti-Semitism" and "applies to institutions that traffic in anti-Semitic hate."
"Our message to universities," Trump said, is "if you want to accept the tremendous amount of federal dollars you get every year, you must reject anti-Semitism."
"This action further demonstrates the unwavering commitment of President Trump and his Administration to combating all forms of anti-Semitism."