NORTHVILLE, Mich. (AP) — Michigan Gov. Rick Snyder is asking the Obama administration for a “full review” of security clearances for refugees who could be placed in Michigan.

Snyder’s office released a letter that was sent Monday to Secretary of State John Kerry and the head of Homeland Security after the attacks in Paris and Beirut. The governor says he’s “unwavering” in welcoming refugees to Michigan but adds that his first priority is keeping people safe.

At an event in suburban Detroit, Snyder told reporters that he wants to ensure that terrorists are not part of the refugee process. On Sunday, a day earlier, the governor said the state is postponing efforts to accept refugees.

Some people are criticizing Snyder. State Rep. Stephanie Chang, a Detroit Democrat, says the governor is “moving backward.”