National Leader Simon Bridges is no longer worried about who leaked his travel expenses.

His travel expenses, which were leaked earlier in the year,  showed he had spent more than $100,000 on travel and accommodation in the last quarter. 

Trevor Mallard and Parliamentary Service staff have been cleared of any involvement after the Speaker commissioned his own secret inquiry.

He did so after hearing the National Party leader had been privately blaming him for the leak.

Bridges said there's a number of possible sources of the leak and it could be anyone.

"The reality is, don't get me wrong, I accept there is media interest in it but it's not what I am focusing on particularly. It's things like the tax to the Government, the spend of the Government they are the things I know matter to Kiwis."

When asked by Newstalk ZB's Mike Yardley Simon Bridges said the inquiry is important to ensure the integrity of the system.

"Sometimes you have got to do that right thing."

"I wouldn't overplay it but the reality is when you look at how Speaker Mallard has handled it, when he publically called off an inquiry, there was speculation that fell on a number of my members of parliament, so from that lens it was the right thing to do." 

"There is an integrity fo the parliamentary systems here." 

LISTEN ABOVE AS SIMON BRIDGES SPEAKS WITH MIKE YARDLEY