Did Trump send the DoJ and FBI to investigate this? Or did he send loyalists outside of the government and try to conceal his connection to it? He even went after government officials who expressed concern at how blatantly corrupt it was to bend US foreign policy around an investigation of his main opponent.
And despite that there is still literally 0 evidence of any wrongdoing other than insinuation by the likes of Rudy Giuliani. No documents, no testimony (other than an "affidavit" by the corrupt prosecutor who was fired and is now sponsored by a Russian mob figure...or had you forgotten about Firtash?) , no facts of any kind. You call it treason to investigate Trump for way more smoke than that.