The EU Summit to be held on Thursday in Brussels will have as its main agenda the migrant crisis and the security of the Schengen zone.

While concerns regarding the entry of jihadis posing as refugees will be debated heavily, European Council President Donald Tusk will attempt to keep the migrant crisis separate from the terrorism issue.

EU Commission President Jean-Claude Juncker is in agreement with Tusk on this as the refugees themselves are fleeing Islamic militants like Daesh and Taliban.

At least two of the Paris attackers entered France through the Greek islands, posing as refugees, the BBC had reported.

In 2015, the number of refugees who entered the EU was 920,000, as per data with the International Organization for Migration. 

The Schengen zone encompasses 26 nations and is a sort of free zone for the transport of goods between the nations as well as a passport free zone. 1.7 million people, reportedly, travel across borders every day for work within the Schengen zone.

While the leaders are reluctant to sound like the far-right French National Front (FN), the security issues at the borders have become a huge issue to take care of which a new border control force is being recommended.

"Our goal is clear: we must regain control over our external borders to stem migratory flows and to preserve Schengen," said Tusk in his invite letter for the summit, reported BBC.

"We want to defend everything Schengen represents, and let me tell you that Schengen is here to stay," said Juncker.

The EU commission this week communicated a plan to create a border force that is 1,000 strong, with 1,500 as back up, called EU Border and Coast Guard, to replace the Frontex and Coast Guard.

However, the debate around the establishment of the new border force is fraught with concerns over the sovereignty of a nation since the new force, according to the plan, can be launched without the host nation's permission, if the other countries of the EU consent.

The Daily Sabah quoted Migration Commissioner Dimitris Avramopoulos telling the European Parliament, "We don't replace member states' responsibilities and definitely not their sovereignty."

"This is a safety net which, like all safety nets, we hope will never need to be used. But it is essential to restore the credibility of our border management system," he added.

Polish Foreign Minister Witold Waszczykowski found the idea of replacing the Warsaw-based Frontex as "shocking" while Amnesty International said that the move should not compromise the safety and movement of the refugees fleeing the conflict-ridden nations, reported Daily Sabah.