SYRIA REJECTS IDEA. OF INTERIM SESSION ON THE MIDDLE EAST
Syrian Pres Assad rejects Sadat proposal, news conf after conf with Vance; says working group would be viewed as competing with full-fledged Geneva conf; favors continued talks leading to Geneva conf; says he appreciates US peace efforts but sees no progress toward Geneva this yr; says main issue is not Israel's objection to PLO participation at Geneva, but Israel's denial of Palestinian rights; does not rule out idea that Foreign Min Khaddam might attend Gen Assembly in Sept and meet with Vance (M)