My wife is a dual citizen - American and German. She, at present, has an American passport and no German passport. She's thinking of applying for her German passport. The checklist asks for her most recent travel document. Would we have to submit her German passport, rather than her American one if she applied for and received her German one before we sent off the application? We would prefer to have her apply as an American, due to the generally faster processing times. Or could we submit both?