Vance Luther Boelter, the suspect accused of fatally shooting former Minnesota House Speaker Melissa Hortman and her husband, Mark Hortman, allegedly wrote a letter to the FBI claiming that Governor Tim Walz instructed him to assassinate US Senator Amy Klobuchar so Walz could run for her seat, the Minnesota Star Tribune reported, citing two individuals familiar with the letter’s contents.

The letter, described as rambling and conspiratorial, was reportedly found near Boelter’s home in Green Isle, Minnesota. In it, Boelter, 57, also claimed he had been trained “off the books” by the US military and asserted that Gov. Walz, who has not declared any Senate ambitions, had directed him to target Klobuchar and others.

A spokesperson for the Hennepin County Attorney’s Office, Daniel Borgertpoepping, declined to comment on the letter’s contents, citing the ongoing investigation.

He told Minnesota Star Tribune: “Due to the seriousness of the allegations it contains, we will state only that we have seen no evidence that the allegations regarding Governor Walz are based in fact.”