Sen. Jeff Sessions, R-Ala., Trump's choice to be the next attorney general, and Rex Tillerson, the former ExxonMobil CEO, whom Trump nominated to serve as secretary of state, are scheduled for confirmation hearings in the coming week. So is Betsy DeVos, a billionaire GOP power broker nominated to serve as education secretary.
Tillerson and DeVos are worth hundreds of millions if not billions of dollars, leading some Democrats to describe Trump's nominees in recent days as "a bunch of billionaires."
The letter could undermine GOP hopes of swiftly holding hearings next Tuesday, Wednesday and Thursday - around the same time that Trump is also expected to outline ways he will separate himself from his vast business holdings while serving as president.
The letter adds fuel to Democratic concerns that the incoming administration as well as congressional Republicans are attempting to rush the confirmation of Trump's top picks.
The ethics office's concern "makes crystal-clear that the transition team's collusion with Senate Republicans to jam through these Cabinet nominees before they've been thoroughly vetted is unprecedented," Senate Minority Leader Charles E. Schumer, D-N.Y., said in response. "The Senate and the American people deserve to know that these Cabinet nominees have a plan to avoid any conflicts of interest, that they're working on behalf of the American people and not their own bottom line, and that they plan to fully comply with the law. Senate Republicans should heed the advice of this independent office and stop trying to jam through unvetted nominees."
It wasn't immediately clear what Senate Republicans might do. Aides to Majority Leader Mitch McConnell, R-Ky., didn't immediately return requests for comment.