Trump is having trouble getting cash for his bond. And he's growing frustrated.

The prospect that Donald Trump may fail to post a bond by Monday’s deadline for the $464 million civil fraud penalty against him and his co-defendants has frustrated the former president and some members of his inner circle, a Trump ally and two campaign sources familiar with the situation told NBC News.

Trump, the billionaire developer who is seeking a return to the White House, finds himself in the unprecedented position of hitting up high-dollar donors not just for campaign cash — for which he has an urgent political need — but also to see whether they might guarantee his bond, according to a Trump ally who received such a call from a member of the presumptive GOP nominee's team. The source asked not to be named to speak candidly about sensitive conversations.

New York state Judge Arthur Engoron's ruling in Trump's civil fraud trial was made official Feb. 23, starting the clock on a 30-day automatic stay of the judgment. That period is set to expire Monday, at which point New York Attorney General Letitia James could start seizing Trump’s assets unless an appeals court steps in.

Failure to secure a bond by Monday’s deadline could lead the state to seize Trump’s bank accounts or properties — from Trump Tower in midtown Manhattan to his resorts, golf courses or plane.

In a filing Monday, Trump’s attorneys said securing a bond for nearly a half a billion dollars by next week’s deadline was “a practical impossibility,” despite their best efforts — including “approaching about 30 surety companies through 4 separate brokers.”

Their petition to pause enforcement of Engoron's judgment is still pending before an appellate court, which could intervene on his behalf.

A source close to the Trump family said Trump’s defense team