It took Federal Opposition leader Peter Dutton one weekend to turn 180 degrees and abandon his support for Welcomes to Country at ANZAC services.

After hecklers booed during Elder Mark Brown's welcome at the Naarm Dawn Service, Mr Dutton condemned the interruption and said the welcome was "an important part of official ceremonies and it should be respected".

"We have a proud Indigenous heritage in this country and we should be proud to celebrate it as part of today… And we should always remember to do that and remind ourselves … that Indigenous Australians played a very significant part and still do today in the Australian Defence Force," he said on Friday.

However, on Monday Mr Dutton said Welcomes to Country were overdone and should be only reserved for special occasions. Asked at a press conference if ANZAC dawn services are "significant" enough to feature Welcome to Country ceremonies, he replied: "No."

Mr Dutton said, without reference to evidence, that the majority of veterans "don't want it on that day", but reiterated his criticism of the bigots who heckled during Mr Brown's welcome.

"There is no place for booing of any nature whatsoever at a sacred Anzac Day, regardless of which part you disagree with," he said.

The U-turn comes as Mr Dutton's federal Coalition, which weeks ago appeared set for a win on May 3, seems to be staggering towards the finishing line. The Opposition leader's personal approval rating has sunk into the low 30s and most polls show the conservatives hovering around 48 per cent.

During the fourth leaders debate earlier this month, Mr Dutton suggested Welcomes were "overdone". Asked whether he would continue to have Welcome to Country ceremonies, he said they were a "respectful thing to do" for some events such as the opening of parliament.