The conclusion of Seth’s brief piece:
But for some reason the Trump administration continues to stand by the 2009 opinion, drawn up when Mr. Obama was being awarded the Nobel Peace Prize, which came with a $1.4 million award. The Office of Legal Counsel concluded Mr. Obama could accept the money, but the opinion simply assumed the Foreign Emoluments Clause applied to the presidency. It was taken as a given with no citations either to judicial rulings or to the practices established by Washington and other founders.
We have submitted friend-of-the-court briefs in New York, the District of Columbia and Maryland explaining this argument. At a minimum, the historical record should give Justice pause. But ideally the department would abandon the 2009 opinion and argue in court that the president is not governed by this clause. Mr. Trump’s adversaries are arguing that Washington and Jefferson were crooks.
(The full column is behind a pay wall but is worth reading if you have access.)