The California man who lives part of his life as an “adult baby” and collects Social Security disability payments says the federal agency has cleared him of wrongdoing and will continue sending checks.

Stanley Thornton Jr. now wants an apology from Sen. Tom Coburn, the Oklahoma Republican who called for the benefit review because the investigation disrupted the final months of life for his roommate Sandra Dias, who playacted as his mother, spoon-feeding him and helping him into his baby clothes until her death in July.

“We recently reviewed the evidence in your Social Security disability claim and find that your disability is continuing,” the agency said in an August letter that Mr. Thornton posted on the website he maintains to document his adult baby lifestyle.