Apple says it didn’t know former President Trump’s Department of Justice was asking for the metadata of Democratic lawmakers when it complied with a subpoena seeking information.

Apple’s admission of compliance has raised concerns that tech companies are being caught in problematic territory, when legitimate requests from law enforcement involve customers’ information. A grand jury forced Apple to comply and keep the probe quiet.

It follows a New York Times report that Trump’s officials seized at least a dozen records from people close to the House intelligence panel related to reports on the former president’s contacts with Russia.

According to Apple, the subpoena requested data that belonged to a seemingly random group of e-mail addresses and phone numbers – and a link to Democrat lawmakers wasn’t obvious.