Infrastructure board warned over Adani

Greens leader Richard Di Natale has threatened to haul every Northern Australia Infrastructure Fund director before a Senate inquiry over its dealings with the controversial Adani coal mine.

The Indian company lodged an application for a billion-dollar loan to build a rail line linking the Carmichael mine, in Queensland's Galilee Basin, to the port.

During a Senate inquiry in Canberra on Friday, Senator Di Natale asked NAIF chief executive Laurie Walker why it hadn't been quashed when Adani said the government loan was "not critical" for the project.

"It'll be a matter for the board at the time they are assessing a project," Ms Walker said.

Senator Di Natale was not satisfied by the response and vowed to haul every NAIF director before the committee.

"Today's hearing shows the board has advanced the Adani project against their own investment rules," he said.