He did?
No. Bad form, maybe, unless they have absolute, damning, hardcore proof of guilt - which could be construed as patriotic via either protecting the people/nation from the black eye of an inevitable impeachment OR just the fact that the FBI did their job and caught a national security traitor.
If they are reopening just to feign competence and happen to stumble upon something that would magically exonerate Hill, State dept., DNC, FBI and DOJ all at once (and I wouldn't put it past them). But, yeah, that would be unamerican.