U.S. Sen. Deb Fischer, who has largely ignored her campaign opponent until recently, called a press conference Thursday and criticized former Omaha union leader Dan Osborn as a nationally backed threat to a possible Republican majority in the Senate.

Allegations flew Monday in Nebraska’s most competitive U.S. Senate race, with one campaign threatening legal action over campaign advertising and a report about talk of “Hitler Youth.” Nebraska nonpartisan candidate Dan Osborn’s campaign sent a cease and desist letter to an outside group advertising in support of U.

U.S. Senate candidate Dan Osborn’s campaign issued a letter to incumbent U.S. Sen. Deb Fischer’s campaign and a political action committee demanding they cease-and-desist running campaign ads he says