Democrat Tim Kaine of Virginia is the most recent one. And Republicans Crapo and Young, from Idaho and Indiana respectively, are two others from April.

Sources:
https://www.bnnbloomberg.ca/senate-democrat-urges-biden-to-repeal-tariffs-to-fight-inflation-1.1787314

https://www.breitbart.com/politics/2022/04/26/senate-republicans-working-to-help-biden-further-cut-u-s-tariffs-on-china/

Edit: a more complete list of senators for/against.
https://prosperousamerica.org/senators_china_tradewar_tariffs_pat_toomey_mike_crapo_jacky_rosen/

Democrat Tim Kaine of Virginia is the most recent one. And Republicans Crapo and Young, from Idaho and Indiana respectively, are two others from April.

Sources:
https://www.bnnbloomberg.ca/senate-democrat-urges-biden-to-repeal-tariffs-to-fight-inflation-1.1787314

https://www.breitbart.com/politics/2022/04/26/senate-republicans-working-to-help-biden-further-cut-u-s-tariffs-on-china/