Boelter is accused of killing Democratic Minnesota state Rep. Melissa Hortman and her husband, Mark, and wounding Democratic state Sen. John Hoffman and his wife, Yvette, in "political assassinations," acting U.S. Attorney for the District of Minnesota Joseph Thompson said.

Boelter allegedly had firearms and a list of 45 elected officials in notebooks in his car, law enforcement said.

The 57-year-old father-of-five is accused of killing one lawmaker and her husband and wounding another and his wife in an attack that "appears to be a politically motivated assassination"