Jeff Sessions, during a hearing to become the 84th attorney general, admitted Tuesday to omitting details about ownership in oil interests and that he plans to update his own financial disclosure forms submitted last month with the Office of Government Ethics.

The omission was first noted by The Washington Post in an article Monday. In it, Democrats on the Senate Judiciary Committee criticized the omission calling it a "serious matter."

The interests, according to the newspaper, are located in the Choctaw National Wildlife Refuge in southwestern Alabama. According to the article, Sessions owns subsurface rights to oil and other minerals on more than 600 acres adjacent to the wildlife preserve. The holdings are small, the article states, generating revenue in the range of $4,700 annually.

During the first day of hearing before the Judiciary Committee, Sessions was asked about that omission from Democratic Senator Dianne Feinstein of California.

The second, and final, day of hearings are scheduled to begin at 8:30 a.m. Wednesday.

"Alabama records show that the senator leased undivided mineral interests to Chief Capital (of Texas) in 2015, do you own these interests?" Feinstein asked.

Sessions replied, "I believe that is so. We'll find out what we did or didn't do and correct it."

Sessions said that "at least 50 years or more ago," his family sold land in reserved mineral rights. He admitted that he wasn't sure how much "land is out there that I own mineral rights on."

"We reported the income on my return as coming from the property I own and the property the oil well is on," said Sessions. "I did not note in that report (with the Office of Government Ethics) that it was specifically oil income."

Sessions said that his family's assets are rather simple, and include a host of Vanguard mutual funds and municipal bonds. "I don't own individual stocks," he said.

The ethics report also shows that Sessions owns residential property and timber land in Monroe County and farmland in Wilcox County. The Wilcox County farm, which is valued between $500,000 to $1 million, generates annual revenue between $5,001 to $15,000 each year, the report shows.

Terry Potter, in a quote to The Washington Post, said that Sessions' ethics forms need to be adjusted and that the senator -- if confirmed as attorney general this week -- should recuse himself from Department of Justice policies concerning drilling or environmental issues.

Sessions omission is notable in that Democrats have argued that Republicans are attempting to rush through President-elect Donald Trump's Cabinet picks without having completed information within the ethics reports. The reports are utilized by federal officials to determine if any conflict of interests exists.

Sessions, compared to other Trump nominees, has not been among the biggest worries for federal officials who examine conflicts of interest. Trump's cabinet nominees such as Rex Tillerson, the secretary of state nominee; Wilbur Ross Jr., the commerce secretary nominee; Betsy DeVos, the education secretary nominee; and Steven Mnuchin, the Treasury secretary nominee. Ross, DeVos and Mnuchin each hold assets valued at more than a billion dollars.