First, "They".. they who? Nothing's changed since crying on twitter came out, and there's not real concern from Democrats, Independents, or moderate Republicans.
The best information available about the judge signing FISA warrants is that the first request was denied, the second request once drawn more narrowly, was approved. This is pretty standard practice. This was approved, and arguably spying. But if it was "spying", all data currently supports it being legal; the DoJ went by the book. The Steele dossier wasn't the only piece of information the judge had. Even if it was, Christopher Steele headed up MI-6's Russia desk for three years. While not an expert in Donald Trump, he has extensive experience dealing with Russia, and finding someone better OR more experienced is a very tall order. Even now, some of it's been corroborated, much of it is still uncorroborated, and only one point is something we could rule out.
It feels like the heart of the argument "they" are looking into revolves around the judge. So lets follow that road.
- Does any actual evidence exist that we should question the FISA judge?
- That we should question this judge's motives?
- Has this judge previously displayed an inability to set aside any prejudice they have to follow the law?
- Anything that supports "someone else" directed this judge to sign off on it?