Federal and state authorities have issued over 40 grand jury subpoenas in an escalating investigation into a suspected imposter candidate named Dan Sullivan running in Alaska's election. The DOJ is probing potential deprivation of rights, alleging voter dilution. More subpoenas are expected, according to Fox News.

Democrat Rep. Mary Peltola faces scrutiny as the investigation intensifies. Alaska Gov. Mike Dunleavy has launched a parallel state probe. Dunleavy says the questioned Sullivan refused to testify under oath to state investigators.

Election day is Tuesday.