An international outcry ensued, and Reagan decided to commit Marines to a new MNF. On October 28, Reagan signed National Security Decision Directive (NSDD) 64, calling for the United States to work toward the withdrawal of foreign forces from Lebanon, help rebuild the Lebanese Army, and contribute to an expanded MNF if necessary. In April–May 1983, Secretary of State George Shultz helped Israel and Lebanon negotiate an agreement that ended the hostilities between the two countries and provided a basis for normal relations once Israel withdrew. For Israel to withdraw, however, Syrian and Palestinian forces would also need to leave Lebanon.