Intelligence officials have determined that Islamic extremists have explored using the refugee program to enter the United States, the head of the House Homeland Security Committee said on Monday.

Rep. Michael McCaul (R-Texas) declined to go into detail about the determination, which the Obama administration has not announced publicly.

Yet the disclosure could add ammunition to critics of the White House’s refugee plans who have warned that the program is vulnerable to infiltration by adherents of the Islamic State in Iraq and Syria (ISIS).

“ISIS members in Syria have attempted to exploit it to get into the United States,” McCaul said during a speech at the National Defense University.

Read the article “ISIS Has Targeted Refugee Program to Enter US, Homeland Security Chairman Says” on thehill.com.