The China travel ban wasn't opposed, it was ineffective because it was both late, and then they wasted all the useful time you could've gotten by not stopping indirect travel or travel from Europe where it was already spreading at the time.

By the time a European travel ban was created, it was basically pointless because spread within the US was at wildfire levels compared to any possible contribution from international travel (the question of the morality of forcing flight crews to expose themselves to a deadly novel virus is of course quite a different one).

The story of the Trump pandemic response is taking weak action months too late.