It was a surety - but now it's just an optimistic prediction.

Malcolm Turnbull wouldn't repeat his claim made twice on Tuesday that the coalition would win the July 2 election.

Instead, on Wednesday when asked what made him think that, he said he's seen a growing optimism in the community that the government's strong leadership can secure their future.

"We are confident that Australians will return us to government but it is their decision," he told reporters.

"The choice is theirs. The choice is all of ours. And the choice is very clear."

Mr Turnbull wrapped up his second visit to the west this campaign attending a small business breakfast in the Liberal-held seat of Swan.

There he described Britain's possible exit from the European Union as one of the great global challenges.

"There are some challenges and risks out there," he said at the Royal Perth Golf Club.

"What's going to happen with the vote in the UK? Is Britain going to leave the European Union?

"We don't know. They could."

He used the British referendum, to be held in a week's time, to argue Australia needs a strong, stable government committed to growing the economy and boosting jobs.

Having campaigned with his wife Lucy in North Queensland and Perth this week, Mr Turnbull then jetted back east to Sydney.

He became emotional watching her receive the Verdienstkreuz am Bande - the German Cross of the Order of Merit.

"I love you so much and you are such a credit to Australia," he said.

Mrs Turnbull has just finished three years as the honorary president of the German-Australian Chamber of Industry and Commerce.

The prime minister finished the day attending a service at St Andrews Cathedral for those gunned down in the Orlando shooting.