Conroy told ABC radio today that there were "no analysis or facts" behind the claims as he stood by the NBN’s corporate plan which places the entire project at a cost of $37.4 billion.
The Coalition's policy on broadband is expected to be released this week, while details of its costing were leaked as we reported earlier today.
That document also states that the network will be finished in in 2025, four years late.
"The corporate plan, audited by the Auditor-General, is produced each year, and what you're seeing in that corporate plan is $37.4 billion is the cost of building the NBN - not, as today the Coalition is claiming, $90 billion. I mean, the Coalition are a fact-free zone. They don't have any facts to support these claims," Conroy said today on ABC Radio.
But Turnbull then tweeted: "The NBN Co's corporate plan has NOT been audited by the auditor general.
"Conroy's statement that it has been is false and he knows it."
Curiously, the tweet has since been deleted.
As we previously reported there have been major delays in the NBN rollout, and Conroy admitted as such today but not without reiterating the three-month delay could be made up over the next few years.
"This is not that the 10 years has been 'blown out', as the Opposition are claiming today. They are claiming today it's going to take 'til 2025. They have no analysis behind these claims; no analysis or facts behind $90 billion, no analysis or facts behind 2025 as a finish date," he told ABC's AM radio program.