Sounds like if Trump recorded his meeting/phone calls with Comey, congress will subpena those recordings.
Congress was stonewalled when they tried to get documents from the Obama administration on Fast and Furious, the IRS scandal, Benghazi, etc. even with subpoenas. Obama declared executive privilege. Hillary destroyed over 30,000 emails without being charged with a crime.
There are rumors that Obama had a recording system in place in the WH. Perhaps Trump took advantage of that system. There is nothing wrong with recording telephone calls, meetings, etc. JFK and LBJ did it along with Nixon.
Congress needs to suponea Comedy’s tapes and conversations