WASHINGTON (AP) — Aiming to prove their commitment to Israel, senior U.S. lawmakers are backing bipartisan legislation that would slap Iran with new sanctions while maintaining rigorous enforcement of the landmark nuclear deal. The measures, unveiled at the opening of the annual American Israel Public Affairs Committee conference, seek to build consensus among Republicans and Democrats who are so often bitterly at odds on domestic issues. In exchange for Tehran rolling back its nuclear program, the U.S.