Republicans in the U.S. House of Representatives challenged President Barack Obama on Tuesday to get tougher with Islamic State militants and promised to develop legislation quickly to suspend resettlement of Syrians in the United States.
"ISIS showed they are committing an act of war against the West," House Speaker Paul Ryan told reporters after a closed-door meeting of House Republican lawmakers, using a common acronym for the militant group.
See harrowing photos from Syria and Europe's migrant crisis:
General migrant crisis - Syrian refugees, entering all European countries
Republicans want tougher response to ISIS 'war'
Syrian refugee child Jana Makkiyeh, 3, whose family comes from Damascus, Syria, holds a teddy bear while standing near her family's tent at a makeshift camp for asylum seekers in Roszke, southern Hungary, Thursday, Sept. 10, 2015. Leaders of the United Nations refugee agency warned Tuesday that Hungary faces a bigger wave of 42,000 asylum seekers in the next 10 days and will need international help to provide shelter on its border, where newcomers already are complaining bitterly about being left to sleep in frigid fields. (AP Photo/Muhammed Muheisen)
A Syrian refugee woman and her daughter, right, sleep while waiting in a bus before being taken by Hungarian police to board a train to the Austrian border, in Roszke, southern Hungary, Tuesday, Sept. 15, 2015. With Hungary cracking down, desperate people fleeing Syria, Afghanistan and elsewhere struggled to make it into the country, hoping to reach Western Europe before it was too late. (AP Photo/Muhammed Muheisen)
A young Syrian boy is wrapped with a thermal blanket as he arrives with others at the coast on a dinghy after crossing from Turkey, at the island of Lesbos, Greece, Monday, Sept. 7, 2015. The island of some 100,000 residents has been transformed by the sudden new population of some 20,000 refugees and migrants, mostly from Syria, Iraq and Afghanistan. (AP Photo/Petros Giannakouris)
Afghan child Sohrab Naveed, 1, whose family comes from Kabul Afghanistan, is held by his mother while waiting with others to get into a bus that will take them to the center for asylum seekers, after crossing the Serbian-Hungarian border near Roszke, southern Hungary,Sunday, Sept. 13, 2015. At least four countries Friday firmly rejected a European Union plan to impose refugee quotas to ease a worsening migrant crisis that Germany's foreign minister said was "probably the biggest challenge" in the history of the 28-nation bloc. (AP Photo/Muhammed Muheisen)
A Syrian boy tries to warm up himself near the border train station of Idomeni, northern Greece, as he waits with his family to be allowed by the Macedonian police to cross the borders on Wednesday, Aug. 12, 2015. Greece is Europe's main entry point for people arriving by sea, as the alternative route from north Africa to Italy has become increasingly dangerous due to fighting in Libya. From Greece, the migrants move north through the Balkans, hoping to gain asylum, preferably in Germany, the Netherlands or Scandinavia. (AP Photo/Giannis Papanikos)
Migrant and refugee children lie on the ground during a demonstration to protest against Turkish police blocking the access to the road and the ticket office for the Turkey-Greece border towns on September 15, 2015 at Istanbul's Esenler Bus Terminal. Over half a million migrants have crossed the European Union's border so far this year, up from 280,000 in 2014, the bloc's Frontex border agency said on September 15, 2015 -- but warned some people may have been counted twice. AFP PHOTO / YASIN AKGUL (Photo credit should read YASIN AKGUL/AFP/Getty Images)
ROSZKE, HUNGARY - SEPTEMBER 13: A young boy wraps up to keep warm as migrants wake up to a cold morning at the Hungarian border with Serbia on September 13, 2015 in Roszke, Hungary. A record number of 4,000 people crossed the Hungarian border with Serbia yesterday. Migrants are rushing to the border due to fears that the borders will soon close before the official closure of midnight on Monday, September 14th. Since the beginning of 2015 the number of migrants using the so-called 'Balkans route' has exploded with migrants arriving in Greece from Turkey and then travelling on through Macedonia and Serbia before entering the EU via Hungary. The number of people leaving their homes in war torn countries such as Syria, marks the largest migration of people since World War II. (Photo by Christopher Furlong/Getty Images)
SANLIURFA, TURKEY - OCTOBER 28: (TURKEY OUT) Kurdish refugee children from the Syrian town of Kobani look on near makeshift tents in a camp in the southeastern town of Suruc, Sanliurfa province October 28, 2014. Kurdish fighters, supported by US-led air strikes, have fended off the Islamic State militants offensive into the besieged Syrian border town of Kobani for the last 44 days but remain ill equipped and short on ammunition. (Photo by Kutluhan Cucel/Getty Images)
ALEPPO, SYRIA - JULY 02: Mother of Syrian child refugee 8-year-old Ahmet Kedru, with partial thickness burns on the face, Aisha Kedru weeps as her son demands support for an aesthetic surgery from Turkish doctors to return to the old days on July 02, 2015 in Aleppo's district Azaz. When Ahmet and his family members were inside of a tent that they take shelter in at Azaz district, the tent is burned out. Fire damaged both him and his mother. (Photo by Kerem Kocalar/Anadolu Agency/Getty Images)
Syrian refugees wait for transportation after crossing into Turkey from the Syrian town of Tal Abyad, near Akcakale in Sanliurfa province, on June 10, 2015. Thousands of people crossed from Syria into Turkey on June 10 to flee a battle pitting Islamist insurgents against Kurdish and opposition forces for the Syrian border town of Tel Abyad. AFP PHOTO/STR (Photo credit should read STR/AFP/Getty Images)
SANLIURFA, TURKEY - JUNE 06: A Turkish soldier carries a Syrian girl as she crosses into Turkey with her family from the borderline in Akcakale district of Sanliurfa on June 06, 2015. Hundreds of Syrians who fled from Syria after clashes between Syrian government forces and opponents in Rasulayn region of Al-Hasakah, have crossed into Turkey since Wednesday. (Photo by Halil Fidan/Anadolu Agency/Getty Images)
A Syrian refugee woman sits as a child sleeps near her early in the morning on Taksim Square, Istanbul, on May 26, 2015. Britain's David Cameron and Russia's Vladimir Putin have agreed to re-start talks on finding a solution to the crisis in Syria, a statement from Cameron said on May 25. AFP PHOTO/BULENT KILIC (Photo credit should read BULENT KILIC/AFP/Getty Images)
A Syrian Kurdish boy peers as children take lessons on November 10, 2014 in a makeshift school tent in a refugee camp in the town of Suruc, Sanliurfa province. Turkey's maintained an 'open door' policy for all those fleeing Syria's civil war and there are now over 1.5 million Syrian refugees living in the country. More than 280,000 Syrian refugees are living in refugee camps, mostly in the southeast, according Turkey's Disaster and Emergency Management Authority (AFAD). AFP PHOTO / ARIS MESSINI (Photo credit should read ARIS MESSINIS/AFP/Getty Images)
Kurdish people watch the Syrian town of Kobane, also known as Ain al-Arab, from the Turkish border in the southeastern village of Mursitpinar, Sanliurfa province, on October 18, 2014. Turkey is turning a deaf ear to insistent pressure to take a more pro-active stance in the fight against Islamic State (IS) jihadists, adding to existing strains with the West under President Recep Tayyip Erdogan. Western diplomats have repeatedly made clear they want to see the key NATO member play a key role in the coalition against the militants, who are battling for the Syrian town Kobane just a few kilometers from Turkey. AFP PHOTO / ARIS MESSINIS (Photo credit should read ARIS MESSINIS/AFP/Getty Images)
A child cries as Syrian Kurdish people arrive after crossing the border between Syria and Turkey after several mortars hit both side in the southeastern town of Suruc, in the Sanliurfa province on September 29, 2014. Tens of thousands of Syrian Kurds flooded into Turkey fleeing an onslaught by the Islamic State (IS) group that prompted an appeal for international intervention. Some of the refugee now want to return to protect their homes and join the fight against IS militants. AFP PHOTO/BULENT KILIC (Photo credit should read BULENT KILIC/AFP/Getty Images)
Refugees buy tickets at the port of Mitylene on the northeast Greek island of Lesbos to get on board a ferry traveling to Athens, on Tuesday, Sept. 8, 2015. This island of some 100,000 residents has been transformed by the sudden new population of some 20,000 refugees and migrants, mostly from Syria, Iraq and Afghanistan. (AP Photo/Santi Palacios)
Afghan refugees play with a baby at the port of Mitylene on the northeast Greek island of Lesbos while waiting to board a ferry traveling to Athens, on Tuesday, Sept. 8, 2015. The island of some 100,000 residents has been transformed by the sudden new population of some 20,000 refugees and migrants, mostly from Syria, Iraq and Afghanistan. (AP Photo/Santi Palacios)
A group of migrants scan the border area from an abandoned military watch post by the border between Serbia and Hungary, near the village of Horgos, Serbia, Friday, Aug. 28, 2015. Record numbers of migrants fleeing violence and poverty in countries such as Syria, Afghanistan and Eritrea are trying to reach Europe this year, despite the risks of perilous sea crossings and little humanitarian assistance. (AP Photo/Darko Vojinovic)
Syrian refugees wait at the port of Lesbos island, Greece, to board a ferry traveling to Athens, on Monday, Sept. 7, 2015. The island of some 100,000 residents has been transformed by the sudden new population of some 20,000 refugees and migrants, mostly from Syria, Iraq and Afghanistan. (AP Photo/Petros Giannakouris)
Eight-month-old Maria and her father Ibrahim from near of Damascus, Syria, look out of the window during their trip by train from Salzburg, Austria, in Munich, Austria, Saturday, Sept. 5, 2015. Since four month they are on their way from Syria via Budapest, Vienna to Germany. (AP Photo/ Kerstin Joensson)
In this photo taken on Monday, Aug. 31, 2015, Syrian men rest as they travel by train from Belgrade to the northern Serbian town of Subotica. The vast majority of migrants are from Syria and Afghanistan, reaching the eastern Aegean Greek islands from the nearby Turkish coast, before heading north to cross the border with Macedonia, Serbia and Hungary and onwards to more prosperous European countries. (AP Photo/Santi Palacios)
A migrant from Syria sleeps at a park in Belgrade, Serbia, Wednesday, Aug. 26, 2015. Thousands of migrants, including many women with babies and small children, have crossed into Serbia over the past few days and are heading toward Hungary and the E.U. (AP Photo/Marko Drobnjakovic)
A young migrant woman from Syria looks from a window onboard a train towards Serbia, at the new transit center for migrants on the border with Greece, near southern Macedonian town of Gevgelija, on Monday, Aug. 24, 2015. Thousands of migrants have poured into Macedonia and board trains and busses that are taking them a step closer to the European Union. Police are letting the migrants pass across the border Monday, directing them to the new transit center for migrants near the border line. (AP Photo/Boris Grdanoski)
Eight-month-old baby Nejmi, from Aleppo, Syria, sleeps on a sidewalk near Basmane train station in the coastal city of Izmir, Turkey, Saturday, Aug. 15, 2015. The migrants hope to make it to Greece in boats and eventually reach wealthier European countries north. (AP Photo/Sait Serkan Gurbuz)
A migrant from Syria waits at the port of Kos island, Greece, on Tuesday, June 2, 2015, after she and others were rescued by Greek Coast Guard while they were trying to cross from Turkey to Greece on a dinghy. Greece and Italy are the main points of entry into the European Union for refugees and economic migrants from the Middle East and Africa hoping to reach other European Union countries. (AP Photo/Petros Giannakouris)
In this Thursday, Sept. 10, 2015 photo, a Jordanian soldier carries a Syrian child arriving in Jordanian territory in the Roqban reception point near the northeastern Jordanian border with Syria, and Iraq, near the town of Ruwaished, 240 km (149 miles) east of Amman. The commander of Jordan's Border Guard told The Associated Press that 199 refugees crossed from Syria into Jordan on Thursday. (AP Photo/Raad Adayleh)
In this Wednesday, July 22, 2015 photo, Syrian refugee Eidah Hassoun, 36, sits with her children inside their tent at an informal tented settlement near the Syrian border on the outskirts of Mafraq, Jordan. More than 10,000 children have died in Syria's four-year conflict, while over 2.8 million in and out of the country donât go to school, according to the U.N. children's agency, UNICEF. (AP Photo/Muhammed Muheisen)
A Syrian refugee carries a baby after crossing over the broken border fence into Turkey from Syria in Akcakale, Sanliurfa province, southeastern Turkey, Sunday, June 14, 2015. The mass displacement of Syrians across the border into Turkey comes as Kurdish fighters and Islamic extremists clashed in nearby city of Tal Abyad. (AP Photo/Lefteris Pitarakis)
Under the watchful eye of Turkish soldiers, top, Syrian refugees are stuck after breaking the border fence and crossing into Turkey from Syria, in Akcakale, Sanliurfa province, southeastern Turkey, Sunday, June 14, 2015. The mass displacement of Syrians across the border into Turkey comes as Kurdish fighters and Islamic extremists clashed in nearby city of Tal Abyad. (AP Photo/Lefteris Pitarakis)
Syrian refugee children sit on the ground inside their tent home as they take their dinner at a Syrian refugee camp, in Deir Zannoun village in the Bekaa valley, eastern Lebanon, on Monday, Jan. 5, 2015. A snow storm is expected to hit Lebanon Monday affecting Syrian refugees, many of whom live in tents without heating. The government estimates there are about 1.5 million Syrians in Lebanon, about one-quarter of the total population. (AP Photo/Hussein Malla)
A Syrian Kurdish refugee child from the Kobani area eats bread at a refugee camp in Suruc, near the Turkey-Syria border Wednesday, Nov. 5, 2014. Kobani, also known as Ayn Arab, and its surrounding areas, has been under assault by extremists of the Islamic State group since mid-September and is being defended by Kurdish fighters. (AP Photo/Vadim Ghirda)
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Ryan said party leaders had assembled a task force to consider legislation "as quickly as possible" that would suspend at least temporarily Obama's plan to admit 10,000 Syrian refugees to the United States.
"This is a moment where it is better to be safe than sorry."
Paul Ryan, House Speaker
"So we think the prudent, the responsible thing is to take a pause in this particular aspect of this refugee program in order to verify that terrorists are not trying to infiltrate the refugee population," Ryan said.
Several Republicans said they wanted a vote on such legislation as soon as this week.
I'm delighted to see @SpeakerRyan say we need to put a pause on accepting #SyrianRefugees, good for him. This is about national security.
The attacks in Paris on Friday which killed 129 people have prompted calls from many U.S. lawmakers, mostly Republicans, to bar all Syrians from entering the country. Immigration, like the threat of terrorism, has been a hot-button issue in the 2016 U.S. presidential election.
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In Paris, France's President Francois Hollande told a joint session of parliament "France is at war" after the attacks.
Arguing that the attacks had proven they pose too much of a threat to the United States, a few U.S. lawmakers want to include a provision to block them in a spending bill that must pass by Dec. 11 to prevent a government shutdown.
Several state governors, most Republicans, also vowed on Monday to refuse the resettlement of any Syrians in their states.