By Travis Wussow and Joe Carter

Recently more than half the nation’s governors—27 states—have expressed opposition to letting Syrian refugees into their states. Many lawmakers in Congress are also considering legislation that would suspend the Syrian refugee program. Here is what you should know about the current controversy:

Why is there a new concern about allowing Syrian refugees into the U.S.?

According to the French government, at least one of the terrorists in the recent attack on Paris is believed to have entered the country by posing as a refugee. The concern is that through inadequate screening procedures, similar would-be terrorists may be able to enter the U.S.

What is the Syrian refugee crisis?

For the past four years, Syria has been in a civil war that has forced 11 million people— half the country’s pre-crisis population—to flee their homes. About 7.6 million Syrians have been internally displaced within the country and 4 million have fled Syria for other countries. The result is one of the largest forced migrations since World War Two.

Are all the refugees fleeing Islamic State (ISIS)?

Not necessarily. The crisis is mostly caused by the civil war in Syria. In 2011, during the Middle Eastern protest movement known as the Arab Spring, protesters in Syria demanded the end of Ba’ath Party rule and the resignation of President Bashar al-Assad, whose family has held the presidency in the country since 1971. In April 2011, the Syrian Army was sent to quell the protest and soldiers opened fire on demonstrators. After months of military sieges, the protests evolved into an armed rebellion and has spread across the country.

Although the conflict was originally between factions for and against President Assad, the civil war has broadened into a battle between the country’s Sunni majority against the president’s Shia Alawite sect. The conflict has drawn in neighboring countries and world powers and lead to the rise of jihadist groups, including Islamic State.

Continue reading at erlc.com/article/explainer-what-you-should-know-about-the-syrian-refugee-controversy.