“It’s worth at least noting that Mike Flynn’s phone was definitely tapped while Obama was in office. How else would a transcript of Flynn’s conversation with the Russian Ambassador from late December exist? His call was monitored and recorded, and then the transcript was leaked. Is it that much of a stretch to say Trump’s phone was tapped as well?”
The NSA has historically recorded phone calls within the district to embassies and officials of interest for later analysis. Once the call is identified, the source can be determined. The tap does not have to be on the source; it can be on the recipient. Your logic is flawed.