I would, if it was a thing he actually did. I’ve said it was unethical for Trump to go there, but an investigation is not “interference” in itself. The Bidens aren’t above scrutiny. It could have made them look like boy scouts if they weren’t corrupt aholes too.
Yes, the investigation IS interference,
simply because of how Trump could then use it. He's doing his best to slam Biden now with the "he should be investigated by Ukraine and China"* schtick. Imagine what he could do with the "Biden is so corrupt Ukraine is investigating him"* schtick. He doesn't need a finding of corruption any more than he needed the FBI to find Hillary had committed a crime. Being investigated is enough fodder for him.
*Disclaimer: These are not actual quotes but only paraphrasing/predicting what is/would be said.