bank - they sought FINANCIAL RECORDS. What kind of idiot would make it out that this was about income tax filings (although I did hear one story that the deutsche records may include copies of tax returns - that's certainly not the same thing though.)
https://www.washingtonexaminer.com/news/lawrence-odonnell-source-says-russian-oligarchs-co-signed-trumps-deutsche-bank-loans
"This single source close to Deutsche Bank has told me that the Trump — Donald Trump's loan documents there show that he has co-signers. That's how he was able to obtain those loans. And that the co-signers are Russian oligarchs," he said.