The Turnbull government's hopes it can pass its landmark "super savers" scheme for first home buyers this year appear all but dashed.

The legislation for the scheme, set to be introduced on Monday, will require the support of all but two crossbench senators.

Treasurer Scott Morrison drew attention to the plight of the scheme on Wednesday amid questions about the ongoing citizenship fiasco.

"If you're saving right now for your first home, then you are far more interested in making sure the Parliament legislates to give you a tax cut on your first home savings than who my parents are or anyone else's parents are and I think that gives the issue some focus," he said, adding the government had "been working constructively with the crossbench".