Proposed foreign interference laws are going through "very intense consideration", but Prime Minister Malcolm Turnbull won't say if that includes the unintended consequences for charities.
Charities would be prevented from using foreign donations for political campaigning under the proposed laws, something Labor says it will not support.
A parliamentary committee is currently investigating the proposed laws, which have already been re-written over concerns it could have criminalised journalism.
Asked on Monday if greater protection for charities would be considered to secure Labor's support, Malcolm Turnbull refused to engage.
"We always seek to obtain bipartisan and cross-party, wherever possible, support for national security legislation. I think it's very important," he said.
"I don't want to go through particular amendments, but it's a matter of very intense consideration."
Mr Turnbull said Australia's foreign interference laws were written in a bygone era and had to be brought up to date.
Foreign interference as a global security issue will be on the agenda when Mr Turnbull meets with British Prime Minister Theresa May in London later this week.