Is it legal to make public a cover letter?

Is it legal for an employer to make anyone's CL provided to them public any time in the future?

​

Just purely for exampe to illustrate my question. Suppose donald trump has applied to starbucks in 1967. (I don't know)

Can the HR reader talk about that cover letter in 2021? Can he say, oh yeah it was great blah blah, he said this, this and this? Can starbucks release that?

usa jobs
usa jobs resume
usa hotel jobs
usajobs
usa jobs federal government
usa job in ksa
usa jobs
usa jobs login
usa jobs gov
usajobs.gov
www.usajobs.gov
usajobs.com
usajobs
usajobs.gov official