Citizenship bill introduced to parliament

The federal government has introduced to parliament changes to citizenship laws that will block the return of dual citizens suspected of terrorism.

The legislation also allows the government to deport court-convicted terrorists.

"Australian citizenship involves a commitment to Australia - it should not be taken lightly," Immigration Minister Peter Dutton told parliament on Wednesday.

All citizens owed an allegiance to their state or sovereign, he said.

"It's a common bond that unites us all, whether we were born here or chose to make Australia our home."

The loss of citizenship will occur as soon as it was shown that someone had engaged in terrorism.

Those who engage in conduct to help international terrorist activities, use explosive or lethal devices, provide or receive training connected with preparing for, engaging in or assisting in a terrorist act, would lose their citizenship.

The minister will notify a foreign fighter who has ceased to be an Australian citizen.

He can also rescind that notice if it's in the public interest.

Proscribed terrorist organisations will also be declared by the minister.

While the draft laws are not retrospective, parliament's intelligence and security committee has been asked to consider whether they should be.