Rabbi Yisroel Goldstein, who was wounded in the deadly synagogue shooting in Poway, was the President's guest of honor Thursday morning at the White House.
He took part in an event to mark the National Day of Prayer.
"We need to be strong as a group of people that love god whether you call him muhammed, whether you call him shiva...we need to be strong becuase that's the only way we are going to defeat evil," Stewart said.
The President said he would fight with all his strength and everything he had to defeat anti-Semitism.
John T. Earnest, 19, stood stoically and said little during the hearing, and the not-guilty plea was entered on his behalf by an attorney. He remains jailed without bail and is due back in court May 30.
Prosecutors say the 19-year-old man charged with opening fire in a Poway synagogue legally bought the semiautomatic rifle he used.