Peter Dutton is standing by claims Australian war veterans want refugee medical evacuation laws scrapped.

Asked for his source on the claims, the home affairs minister said there were hundreds of veterans living in his Queensland electorate.

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"The vast majority - I can assure you, knowing them personally and knowing the way they think about these matters - would strongly support the government's position," he told reporters in Canberra on Friday.

Mr Dutton has raised the veteran claims as he seeks support from Senate crossbencher Jacqui Lambie - a former soldier - to repeal the so-called medevac laws.

The laws make it easier for asylum seekers held in Nauru and Papua New Guinea to be transferred to Australia for medical treatment.

The changes passed against the government's wishes earlier this year with support from Labor and the crossbench.

A Senate committee investigating the repeal bill is due to release its report on Friday.

Peter Dutton is standing by claims war veterans want refugee medical evacuation laws scrapped. Credit: AAP

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The government-dominated committee is guaranteed to support the repeal, with opposition parties expected to hand down dissenting reports.

Senator Lambie has indicated she will take time to digest the report before casting her deciding vote next month.

However, she has indicated the situation in Syria could influence her position, raising concerns the conflict could trigger an influx of asylum seekers.

Mr Dutton hoped the committee report would clear up any questions Senator Lambie had about the repeal bill.

"As I said yesterday, there are people coming to our country who are of poor character and who shouldn't come here, that have only come here because of the medevac laws that Labor passed," he said.

"That any government, Liberal or Labor, could be compelled to bring people into our country of bad character is completely unacceptable."

The medevac laws allow the minister to block transfers based on national security grounds, but Mr Dutton argues these discretionary powers are too narrow.