"I can't think of any other modern example of a presidential candidate hawking an array of goods for their private benefit," Fischer said.
The website for the Bibles says it has no link to Trump's campaign.
It instead uses Trump's name, likeness and image under paid license from a company called CIC Ventures LLC.
Lessig noted that Trump's business moves do not appear to be violating campaign ethics or financial rules.
A Trump campaign spokesman did not immediately respond to CNBC's request for comment.
Persons:
Donald Trump, hawking, Joe Biden, Trump, Lawrence Lessig, Brendan Fischer, Fischer, Lee Greenwood's, Greenwood, Republican nominee's, Lessig
Organizations:
Trump, Trump —, White, Harvard Law School, CNBC, Republican, New York Times, Ventures, CIC Ventures
Locations:
Florida, West Palm Beach , Florida, Philadelphia