I’m not sure what the legalities are of asking a foreign power to help bring down your political opponents. But we know such activities aren’t limited to just one political party. In addition to the Steel dossier there is this:
I’m not sure I see a reason why having a foreign nation supply legally obtained truthful information on political opponents should be illegal, immoral, or problematic. I have a big problem with people and/or organizations being hypocritical about it.