yes, tim walz did clap back at donald trump's use of the offensive slur "seriously retarded" in a truth social rant about immigration and somali refugees by posting "release the mri results" on x. trump mentioned undergoing an mri last month but results weren't disclosed. this happened on november 28, 2025.

daily beast
https://www.thedailybeast.com/minnesota-gov-tim-walz-demands-trumps-mri-results-after-unhinged-slur-attack

newsweek
https://www.newsweek.com/tim-walz-responds-to-donald-trump-calling-him-seriously-retarded-11123679

the hill
https://thehill.com/homenews/state-watch/5625629-walz-trump-somali-refugees-mri-results