The State Department Monday tried to defend its process of reviewing applications for refugees trying to enter the United States. The effort came after Monday’s attack at Ohio State University a Somali refugee turned terrorist was shot and killed while staging a terrorist attack.

As we reported here, the terrorist bought knives on the day of the attack, rammed his car into a group of people on the Columbus campus and then got out and charged and stabbed passersby with a knife. The terrorist was shot dead by Ohio State University Police Officer Alan Horujko, whose quick action kept more people from being injured, or worse.

The Islamic State took credit for the terrorist attack, and authorities have said the attack did appear to be inspired by the terrorist group.

Republicans have said the possibility of terrorists entering the U.S. as refugees means a more strict vetting process is needed, and some say the U.S. should halt refugee access from certain areas until improvements are made.

But State Department spokesman Mark Toner said the process is already strict and is undergoing constant improvement:

Of course, we’re always assessing and improving the vetting system. But at the same time, let’s be clear that it’s still the most stringent vetting system for any person arriving from abroad into the United States, whether they be traveler or intending immigrant.

And we stand by the integrity of that system.

You can watch the uninspiring defense of the refugee vetting below:

.@statedeptspox on vetting process: “Is it perfect? Can it be perfect? Can it be foolproof? Probably not, no.” pic.twitter.com/5z9dQwEjcs

— FOX & friends (@foxandfriends) September 21, 2016