Abbas' remarks come after an official confirms Israeli and Palestinian envoys clashed over the makeup of their delegations during their last meeting in Jordan.
Khaled Meshal's visit is seen as part of Jordan's effort to engage with previously shunned Islamists, who have been gaining ground across the region in Arab Spring uprisings.
The summit in Sharm el-Sheikh, on the eve of Netanyahu's trip to Washington, is intended to impress on the prime minister the understanding that the confluence of interests between Israel, the Arab nations and the United States demands a serious Israeli response.