The Federal Government has stood by its decision not to release confidential details of its border protection policy.

Immigration Minister Scott Morrison this afternoon fronted a Senate inquiry investigating the Government's refusal to produce documents about its policy to turn boats back to Indonesia.

Mr Morrison told the committee that the Government's policies have led to a significant reduction in boat arrivals, adding there is a clear case to withhold the documents.

"It would not be in our national interest or the public interest to disclose this information that would impede our ability to stop the boats," he said.

Greens and Labor senators pressed Mr Morrison and Operation Sovereign Borders commander Lieutenant General Angus Campbell as to why they are limiting the release of information.

Our live blog brought you the hearing as it happened in Canberra.