A nearly weeklong manhunt continued on Monday for a Wisconsin man the authorities suspect of robbing a gun shop, setting his own station wagon on fire, espousing broad revolution and mailing a threatening manifesto to President Trump.

The Rock County Sheriff’s Department in Janesville, Wis., said that it was searching for Joseph A. Jakubowski, 32, in connection with the burglary on April 4 of more than a dozen firearms from Armageddon Supplies, a local gun store.

Mr. Jakubowski “has been highly agitated recently regarding a variety of political issues” and had specifically threatened to use weapons to target government officials or “an unspecified school,” the department said in a statement.

The department also released a video of Mr. Jakubowski preparing to send a 161-page manifesto to the White House. According to the police, the document “includes grievances against government and personal angst towards anyone or anything other than natural law or rule.”