Sen. Chuck Grassley of Iowa on Wednesday wrote a letter to Sarah Saldana, the director of Immigration and Customs Enforcement, asking follow-up questions related to the government’s response to a previous inquiry by the senator into how Johnny Josue Sanchez of Honduras, the suspect, was able to stay in the country despite having a violent history.

“Specifically, [Grassley] is asking whether Sanchez was not considered a priority under the Obama administration’s Priority Enforcement Program and whether federal authorities were blocked by local sanctuary policies that prevent cooperation with federal immigration officials,” the letter states.

Sanchez was arrested by the Los Angeles County Sheriff’s Office on June 13 for five counts of murder and two counts of attempted murder after he allegedly set fire to a vacant building where five homeless people were squatting, including four individuals from Iowa.