A "security concern" which called police to a court house has also prevented Liberal Senator Jacinta Nampijinpa Price sitting in on part of her trial for allegedly defaming the head of an Aboriginal land council.

The senator's barrister Peter Gray SC raised the concern shortly before the Federal Court broke for lunch in Darwin on Tuesday afternoon.

"My client is not in the court at the moment because of the concern that I refer to," he said when the hearing resumed.

"The concern, as I say, is a security concern," he said.

A Northern Territory Police spokesperson told AAP police were called about "an individual within the Darwin court house".

"The incident was handled by court staff prior to police arrival and officers were subsequently not required," they said.

Senator Nampijinpa Pri

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