Reading on the below page, it seems like you can apply for an ITIN at the time of filing. But the turbotax web interface will not let me finnish my documents without an ITIN. I am a foreigner who doesn't live in the US anymore, so I have to do all of this over mail.
https://turbotax.intuit.com/tax-tips/irs-tax-return/who-needs-an-itin-or-individual-tax-identificati...
