An investigation commissioned by Washington House of Representatives reported, on December 1, 2019, that Shea had planned and participated in domestic terrorism on at least three occasions. This included his participation, organizing, planning, and promotion of the 2014 Bundy standoff in Nevada, the 2015 armed standoff in Priest River, Idaho, and the 2016 armed seizure of the Malheur National Wildlife Refuge in Harney County, Oregon. Shea led a delegation of right-wing legislators from Oregon, Washington and Idaho that met with law enforcement on January 9, 2016, in Burns, Oregon and were appraised of confidential intended law enforcement strategies for dealing with the refuge occupiers. Shea then disclosed those details to Bundy, according to the report.