“I have talked with President Mursi about the peace treaty between Israel and Egypt... and he has assured me that it would be honored by Egypt,” Carter said in Cairo.
“He has suggestions for change, he told me this, and he understands also that any change in the treaty has to be approved by both sides. If it is done unilaterally by Egypt or Israel, the treaty would be destroyed.”
Egypt and Israel signed a peace treaty in 1979 at the White House witnessed by Carter, who was then president of the United States.
The Jewish state has watched with concern, however, as Islamists were catapulted to the forefront of Egyptian politics since a popular uprising that toppled president Hosni Mubarak last year.
Mursi, a long-time member of the Muslim Brotherhood, has repeatedly said he would respect international treaties signed by Cairo.
But the Brotherhood has also said there is room to revise the accords, without objecting to them in principle.