A 74-year-old man has been charged for allegedly sending a bullet to Barnaby Joyce’s electorate office.

The bullet was allegedly sent to the Deputy Prime Minister’s office in Tamworth on November 6, during the New England by-election campaign.

The bullet was sent in an envelope which was opened by a staff member, NSW Police said in a statement.

“People always think these wonderful green lobbyists, they’re all so peaceful,” Mr Joyce told The Australian at the time.

“Well, no. They’ve sent a bullet to my office, and this is the sort of garbage we have to put up with.”

The 74-year-old man was charged on Thursday with one count of using a carriage service to menace/harass/offend and one count of stalk/intimidate intend fear physical harm.

He was conditionally bailed to appear at Armidale Local Court on February 12, 2018.

Investigators are also inquiring into a threatening phone call made to a home on Saturday afternoon, NSW Police said.

Mr Joyce won the by-election with a 64 per cent primary vote after the High Court ruled he had dual New Zealand citizenship and his election was invalid.

-With AAP