The four members of a Georgia militia who are charged with plotting attacks with toxins and explosives against government officials are making a final plea to a federal judge to be released on bond.

The four will return to a federal courthouse in Gainesville on Wednesday to ask U.S. Magistrate Susan Cole to release them.

Investigators have accused 73-year-old Frederick Thomas and 67-year-old Dan Roberts of conspiring to obtain an explosive and possessing an unregistered silencer.

Authorities also charged 55-year-old Ray Adams and 68-year-old Samuel Crump with conspiring and attempting to make ricin, a biological toxin.

The four men have pleaded not guilty and attorneys say the charges are baseless. But prosecutors say they took steps to carry out the plot.