Republicans warn ISIS fighters could infiltrate US as refugees
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Republican lawmakers are pushing the administration on its vetting of Syrian refugees amid plans to increase the number accepted into the United States each year.

Sen. James Lankford (R-Okla.) and Rep. Randy ForbesRandy ForbesTrump makes little headway filling out Pentagon jobs Why there's only one choice for Trump's Navy secretary Trump likely to tap business executive to head Navy: report MORE (R-Va.) sent a letter Wednesday to Secretary of State John KerryJohn Forbes KerryKerry: Trump's rhetoric gave North Korea a reason to say 'Hey, we need a bomb' Russian hackers targeted top US generals and statesmen: report Trump officials to offer clarity on UN relief funding next week MORE and Department of Homeland Security Secretary Jeh Johnson warning that fighters with the Islamic State of Iraq and Syria (ISIS) could try to sneak into the U.S. disguised as refugees.

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"We must be aware that groups like ISIS will infiltrate refugee camps and try to seek admittance into the United States. As you move forward with the process of admitting more refugees into this country, it is critical that rigorous background checks and security measures are in place," they wrote.

Republicans have raised concerns over the administration's ability to vet an increasing the number refugees.

The two lawmakers added on Wednesday that while the United States "is a compassionate country and has a role to play ... we must also ensure that our national security is not compromised in this process."

Democrats have largely backed President Obama's push to accept more refugees while acknowledging that the State Department would need additional funding to help process and vet applicants.

Sens. Patrick LeahyPatrick Joseph LeahyMaxine Waters to Sessions: 'Time to go back to the plantation' Franken has 'a lot of questions' for Sessions on Russia contacts Senate Dems demand Sessions testify after Papadopoulos plea deal MORE (D-Vt.) and Lindsey GrahamLindsey Olin GrahamCNN to air sexual harassment Town Hall featuring Gretchen Carlson, Anita Hill Trump wrestles with handling American enemy combatants Flake: Trump's call for DOJ to probe Democrats 'not normal' MORE (R-S.C.), who is running for president, have introduced legislation that would give the administration an extra $1 billion in funding.

Lankford and Forbes suggested in their letter that as the administration accepts more refugees it should prioritize religious minorities, such as the Yazidis, that have been targeted by ISIS.