ALEXANDRIA, Va. (AP) — The most critical moment in the financial fraud trial of former Trump campaign chairman Paul Manafort will likely arrive this week with the testimony of his “right-hand man” — the person defense attorneys blame for any crimes.

Rick Gates, who also served in a senior role in President Donald Trump’s campaign, has been a key cooperator for special counsel Robert Mueller’s team after he cut a plea deal earlier this year. During that process, Gates admitted to two felony charges, but when he testifies it will be the first time he’ll detail those crimes face-to-face with his former boss and mentor.

The trial, set to resume Monday afternoon in federal court in Alexandria, Virginia, is the first of Mueller’s prosecutions to reach a jury. But lawyers have made no mention of Trump or possible campaign coordination with the Kremlin, the central question behind the special counsel’s investigation.

Still, Trump has made clear his interest in the case, suggesting in a tweet that Manafort was being treated worse than gangster Al Capone. And Manafort’s decision to stand trial instead of cooperate has raised speculation that he may be looking for a pardon.

The trial opened last week with a display of Manafort’s opulent lifestyle, then progressed into testimony about what prosecutors say were years of financial deception. In calling Gates, the government will present jurors with the first-hand account of a co-conspirator expected to say Manafort was knee-deep in an alleged scheme to hide millions of dollars from the IRS and defraud several banks.

Manafort’s defense team has already signaled that it will paint Gates as an embezzler and liar who took advantage of Manafort and flouted the law without his boss’s knowledge. Gates is expected to face bruising cross-examination, and his credibility is likely to be an important test of the prosecution’s case.

During the questioning, U.S. District Judge T.S. Ellis III will be both referee and wild card. He has played those roles throughout the trial, repeatedly scolding prosecutors to rein in their depictions of Manafort’s lavish lifestyle and demanding that they “move it along.” It is not a crime, he has said several times, to be rich and to spend ostentatiously.

Nonetheless, jurors were told of more than $900,000 in expensive suits, a $15,000 ostrich jacket and lavish properties replete with expensive audio and video systems, a tennis court encircled by hundreds of flowers and, as one witness put it, “one of the bigger ponds in the Hamptons.”

One by one, a retired carpenter, a natty clothier and a high-end landscaper detailed how Manafort paid them in international wire transfers from offshore companies.

Prosecutors say Manafort used those companies to stash millions of dollars from his Ukrainian consulting work, proceeds he omitted year-after-year from his income tax returns. Later, they say, when that income dwindled, Manafort launched a different scheme, shoring up his struggling finances by using doctored documents to obtain millions more in bank loans.

On Friday, one of Manafort’s tax preparers admitted that she helped disguise $900,000 in foreign income as a loan in order to reduce his tax burden. Cindy Laporta, who testified under an immunity deal with the government, acknowledged that she agreed under pressure from Gates to alter a tax document for one of Manafort’s businesses.

All told, prosecutors allege that Manafort failed to report a “significant percentage” of the more than $60 million they say he received from Ukrainian oligarchs. They sought to show jurors how that money flowed from more than a dozen shell companies used to stash the income in Cyprus.

Though the names of those companies appeared on wire transfers and at times on his bookkeeper’s ledger, both Manafort’s accountants and his bookkeeper say they never knew that the companies — and corresponding offshore bank accounts — were controlled by Manafort.

When they appeared, the bookkeeper and accountants said, they thought the companies were clients or, in some cases, lenders.

But defense lawyers are trying to convince the jury that Manafort was consumed by his consulting business and left the particulars of his finances to professionals and, in particular, to Gates.

“Money’s coming in fast,” Manafort’s lawyer, Thomas Zehnle, told jurors at the trial’s beginning. “It’s a lot, and Paul Manafort trusted that Rick Gates was keeping track of it.”

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Associated Press writers Matthew Barakat and Stephen Braun contributed to this report.