At a Wednesday press conference, President-elect Donald Trump and his lawyer described the steps the real estate mogul would take to separate from his business empire while in office. It wasn't nearly enough, according to Office of Government Ethics Director Walter Schaub.

"The president is now entering a world of public service," Schaub said in a speech at the Brookings Institution. "He's going to be asking his own appointees to make sacrifices. He's going to be asking our men and women in uniform to risk their lives in conflicts around the world. So no, I don't think divestiture is too high a price to pay to be the president of the United States of America."

Trump said on Wednesday that among other moves, he would hand all management of his businesses to his sons, who would make no new foreign deals and would need an ethics review of any new domestic deals.

Divestiture would require him to go much further. It would mean the sale of all of the president's assets, with their value conveyed to a blind trust — and an investment portfolio of which he and his family would have no knowledge or control.

Of course, no past U.S. president has had business holdings of the scale or complexity of the president-elect's. Trump lawyer Sheri Dillon said at the press conference that would make divestiture unworkable, NPR's Jackie Northam reported.

"The Trump brand is key to the value of the Trump Organization's assets," Dillon said. "If Trump sold his brand, he'd be entitled to the royalties for the use of it."

And if the brand was mothballed entirely, the value of Trump's holdings would crater, and they would have to be sold off in a fire sale.

Nevertheless, that's what Schaub said needs to happen — both to completely safeguard against conflicts of interest, and to set an example.

"The ethics program starts at the top — the signals a president sends [set] a tone across the executive branch," Schaub said, adding that "officials in any administration need their president to show ethics matters, not only through words but through deeds."

The ethics official pointed to the steps undertaken by Secretary of State nominee Rex Tillerson, whose separation from Exxon Mobil reportedly will cost the former CEO about $7 million.

"Mr. Tillerson's making a clean break from Exxon," he said. "His ethics agreement serves as a sterling model for what we'd like to see with other nominees."

Unlike the president, Schaub said, Tillerson worked closely with the ethics office to create his divestment plan.

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