When Donald Trump took office last year, he also grabbed the keys to a car. A very old car.

Several of them, actually. The latest presidential limousine fleet debuted on Barack Obama’s first Inauguration Day in 2009. That had many observers expecting Trump to be presented on his with a new version of the so-called “Beast,” which his predecessor described as “a Caddy, basically on a tank frame.”

One was in the works as Trump made his first trip to the White House as president, it just wasn't ready yet. But Fox News has exclusively learned that its unveiling is just around the corner.

Prototypes of the Cadillac-branded state car wrapped in black and white camouflage (to hide their details from photographers) have been spotted being tested on public roads, and at least one of the dozen or so vehicles that General Motors is set to build under a $15.8 million contract is now with the U.S. Secret Service.

“We’ve completed our task and we’ve handed over the vehicle to the customer,” Cadillac President Johann de Nysschen told Fox News. A spokeswoman for the U.S. Secret Service added that “the program to build and deploy the next generation of Presidential limousines is on track and on schedule — both in terms of vendor production and internal Secret Service post production requirements. The public can expect to see the new vehicles put into operational use late summer of this year.”

"The public can expect to see the new vehicles put into operational use late summer of this year" — U.S. Secret Service

The vehicle’s details are a closely kept national security secret, but the existing model is reportedly more of an armored truck than a luxury sedan and protected against ballistic, explosive and chemical weapons attacks. While obscured by the camouflage, the new one appears to have styling elements similar to Cadillac's flagship CT6 sedan.

One feature it almost certainly won’t share with the CT6 is Cadillac’s semi-autonomous Super Cruise system, which allows for hands-free driving on highways. Instead, it will always be driven by a highly trained agent skilled in defensive and evasive driving techniques.

Cadillac has built every presidential limousine since 1993 and didn’t face any known competition for this contract. Its American luxury counterparts, Lincoln and Chrysler, each told Fox News that they declined to submit bids this time around, but de Nysschen considers his company’s role helping to chauffer the world’s most powerful man around the world an important association for the brand.

“It’s always been part of our heritage and tradition, we have transported presidents over time, and we hope to be able to do so in the future, as well.”

FOLLOW FOX NEWS AUTOS ON TWITTER FOR MORE AUTO NEWS