The mutual support between Trump and Grinell is not going to hurt Trump’s support among conservatives a bit. a few idiots, maybe, but among the other 99%, no.
Even so, by pulling one or two supporters off by finding flaws about Trump, he does run the risk of losing the election. If Deep state has to find 500 flaws to do this, they will look for those 500 flaws and hammer Republicans about them and how supporting Trump makes them immoral.