WASHINGTON — A defense lawyer for a man who planned a mass shooting at the Washington headquarters of a conservative Christian lobbying group says his client should spend 11 ½ years in prison for the failed plot, not the 45 years government lawyers recommended.

A lawyer for Floyd Corkins II made the recommendation Tuesday in a document filed in federal court in Washington. He argues his client was suffering from a mental illness when he entered a building housing the Family Research Council and shot and wounded a security guard in 2012.

The shooting made news in part because Corkins was carrying 15 Chick-fil-A sandwiches and said he intended to smear them in his victims' faces as a political statement.

A judge is scheduled to sentence Corkins on Sept. 19.