The Treasury Department has also eliminated the option of buying as much as $5,000 in extra inflation bonds, beyond the $10,000 annual limit.

President Trump made major policy moves immediately after taking office, withdrawing from major international agreements, promising steep tariffs and pardoning nearly all of the Jan. 6 rioters.

Mr. Trump has said he plans to nominate Billy Long, a former Republican congressman, to the role.

The chief executive of Nvidia, Jensen Huang, has taken advantage of popular loopholes in the federal estate and gift taxes, which have quietly been eviscerated.

© Photo Illustration by Blake Cale; Photographs by Philip Cheung; Haiyun Jiang; Carly Zavala; all for The New York Times; Jim Wilson/The New York Times