Sneakers. Perfume. Trading cards. Bibles.

Those are just some of the products Donald Trump is hawking while he runs to unseat President Joe Biden.

They join a sprawling catalog of Trump-branded merchandise, ranging from steaks to scented candles, that the businessman-turned-president has licensed over the years.

But as his campaign coffers dwindle and his fortune comes under threat, Trump — who has never completely severed his political career from his financial one — is now actively intertwining his business ventures with his White House bid.

“There is no precedent for this level” of business activity during a presidential campaign, Harvard Law School professor Lawrence Lessig told CNBC, though “the trend has been building for many years.”

Brendan Fischer, deputy executive director of money-in-politics watchdog Documented, agreed.

Donald Trump introduced his new line of signature shoes on Feb. 17 in Philadelphia.Chip Somodevilla / Getty Images file

“I can’t think of any other modern example of a presidential candidate hawking an array of goods for their private benefit,” Fischer said.

For an average candidate, that activity might trigger a campaign finance investigation — but it likely won’t for Trump, who has been selling branded goods long before he entered politics, according to Fischer.

“Trump is a unique case,” he said.

That uniqueness was on full display Tuesday, as Trump unveiled his latest promotion: a $60 Bible that includes copies of the nation’s founding documents, along with lyrics from country star Lee Greenwood’s hit song, “God Bless the U.S.A.”

The song by Greenwood, who is partnering with Trump to endorse the high-priced holy book, is a regular needle drop at the presumptive Republican nominee’s campaign rallies.

Trump made the campaign connection even more explicit in a video announcing the promotion, warning that Americans’ rights are under threat and declaring, “we’re gonna get it turned around.” He also invoked his campaign slogan, “Make America Great Again,” multiple times.

It is unclear how much money Trump is making off the Bible — he is receiving royalties from its sales, a person familiar with the arrangement told The New York Times — but whatever he gets will be effectively going into his pocket.

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.

Trump’s 2023 financial disclosure calls him the “Manager, President, Secretary, & Treasurer” of CIC Ventures, and lists his revocable trust as the sole owner of the company. Trump has made more than $5 million in speaking engagements through the company, the disclosure shows. Florida business records show CIC’s address is the same as Trump’s golf club in West Palm Beach, Florida.

Lessig noted that Trump’s business moves do not appear to be violating campaign ethics or financial rules.

“I don’t think there’s any ethical problem with it at all — so long as the proper reporting requirements are complied with,” the professor said.

“There may well be a strategic or brand problem with it, but that’s the same as with any political speech,” he added.

A Trump campaign spokesman did not immediately respond to CNBC’s request for comment.

Trump’s Biblical endorsement came during Holy Week, the run-up to Easter and a sacred time for Christians. It also came less than six weeks after Trump traveled to a sneaker convention in Philadelphia to launch his own line of tennis shoes.