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Egyptian President Abdel Fattah el-Sissi made his toughest remarks yet on Wednesday, saying the current war was not just aimed at fighting Hamas, which rules the Gaza Strip, “but also an attempt to push the civilian inhabitants to ... migrate to Egypt.� He warned this could wreck peace in the region.

Jordan’s King Abdullah II gave a similar message a day earlier, saying, “No refugees in Jordan, no refugees in Egypt.�

Their refusal is rooted in fear that Israel wants to force a permanent expulsion of Palestinians into their countries and nullify Palestinian demands for statehood. El-Sissi also said a mass exodus would risk bringing militants into Egypt’s Sinai Peninsula, from where they might launch attacks on Israel, endangering the two countries’ 40-year-old peace treaty.

Here is a look at what is motivating Egypt’s and Jordan’s stances.

A HISTORY OF DISPLACEMENT

Displacement has been a major theme of Palestinian history. In the 1948 war around Israel’s creation, an estimated 700,000 Palestinians were expelled or fled from what is now Israel. Palestinians refer to the event as the Nakba, Arabic for “catastrophe.�

In the , when Israel seized the West Bank and Gaza Strip, 300,000 more Palestinians fled, mostly into Jordan.

The refugees and their descendants now number nearly 6 million, most living in camps and communities in the West Bank, Gaza, Lebanon, Syria and Jordan. The diaspora has spread further, with many refugees building lives in Gulf Arab countries or the West.

After fighting stopped in the 1948 war, Israel refused to allow refugees to return to their homes. Since then, Israel has rejected Palestinian demands for a return of refugees as part of a peace deal, arguing that it would threaten the country’s Jewish majority.

Egypt fears history will repeat itself and a large Palestinian refugee population from Gaza will end up staying for good.

NO GUARANTEE OF RETURN

That’s in part because there’s no clear scenario for how this war will end.

Israel says it intends to destroy Hamas for its bloody rampage in its southern towns. But it has given no indication of what might happen afterward and who would govern Gaza. That has raised concerns that it will reoccupy the territory for a period, fueling further conflict.

The Israeli military said Palestinians who followed its order to flee northern Gaza to the strip’s southern half would be allowed back to their homes after the war ends.

Egypt is not reassured.

El-Sissi said fighting could last for years if Israel argues it hasn’t sufficiently crushed militants. He proposed that Israel house Palestinians in its Negev Desert, which neighbors the Gaza Strip, until it ends its military operations.

“Israel’s lack of clarity regarding its intentions in Gaza and the evacuation of the population is in itself problematic,� said Riccardo Fabiani, Crisis Group International’s North Africa Project Director. “This confusion fuels fears in the neighborhood.�

Egypt has pushed for Israel to allow humanitarian aid into Gaza, and that it would, though it didn't say when. According to United Nations, Egypt, which is dealing with a spiraling economic crisis, already hosts some 9 million refugees and migrants, including roughly 300,000 Sudanese who arrived this year after .

But Arab countries and many Palestinians also suspect Israel might use this opportunity to force permanent demographic changes to wreck Palestinian demands for statehood in Gaza, the West Bank and east Jerusalem, which was also captured by Israel in 1967.

El-Sissi repeated warnings Wednesday that an exodus from Gaza was intended to “eliminate the Palestinian cause … the most important cause of our region.� He argued that if a demilitarized Palestinian state had been created long ago in negotiations, there would not be war now.

“All historical precedent points to the fact that when Palestinians are forced to leave Palestinian territory, they are not allowed to return back,� said H.A. Hellyer, a senior associate fellow at the Carnegie Endowment for International Peace. “Egypt doesn’t want to be complicit in ethnic cleansing in Gaza.�

Arab countries’ fears have only been stoked by the rise under Israeli Prime Minister Benjamin Netanyahu of hard-right parties that talk in positive terms about removing Palestinians. Since the Hamas attack, the rhetoric has become less restrained, with some right-wing politicians and media commentators calling for the military to raze Gaza and drive out its inhabitants. One lawmaker said Israel should carry out a “new Nakba� on Gaza.

WORRIES OVER HAMAS

At the same time, Egypt says a mass exodus from Gaza would bring Hamas or other Palestinian militants onto its soil. That might be destabilizing in Sinai, where Egypt's military fought for years against Islamic militants and at one point accused Hamas of backing them.

Egypt has backed Israel’s blockade of Gaza since Hamas took over in the territory in 2007, tightly controlling the entry of materials and the passage of civilians back and forth. It also destroyed the network of tunnels under the border that Hamas and other Palestinians used to smuggle goods into Gaza.

With the Sinai insurgency largely put down, “Cairo does not want to have a new security problem on its hands in this problematic region,� Fabiani said.

El-Sissi warned of an even more destabilizing scenario: the wrecking of Egypt and Israel’s 1979 peace deal. He said that with the presence of Palestinian militants, Sinai “would become a base for attacks on Israel. Israel would have the right to defend itself ... and would strike Egyptian territory.�

“The peace which we have achieved would vanish from our hands,� he said, “all for the sake of the idea of eliminating the Palestinian cause.�