WASHINGTON (CNN) - In his first official move as treasury secretary, Timothy Geithner will unveil on Tuesday new rules to crack down on lobbyists for companies that benefited from federal bailouts, according to two senior administration officials late Monday.
Earlier Monday, Senate lawmakers voted to confirm Geithner as the next treasury secretary amid ongoing uncertainty about the nation's economic future.
Geithner, who will spearhead President Obama's response to the financial crisis that threatens to unravel economic growth around the globe, won approval in a 60-34 vote.
Following the vote, President Obama and Vice-President Biden went to the Treasury Department to immediately swear Geithner in - a sign that the president, who originally hoped Geithner would be sworn in on Inauguration Day, wants to get his entire team in place to help sell the $825 billion economic stimulus plan.
The administration officials told CNN that the new rules are aimed at bring more "transparency, accountability and oversight" to the $700 billion federal bailout program, know, as the Troubled Assets Relief Program (TARP), which has come under bipartisan fire.
The officials said Geithner will announce new "stepped-up rules to limit the influence of lobbyists" and special interests involved in the bailout process.
Democrats on Capitol Hill had been pushing for a quick confirmation of Geithner, arguing that the threats facing the economy required immediate action. Sen. Orrin Hatch, R-Utah, cited that rationale in a statement on the Senate floor Monday afternoon.
"I do not believe we have the luxury of leaving this nomination unfilled even another day," said Hatch, who was one of five Republicans to support Geithner's nomination last week when it came before the Senate Finance Committee. "You're not going to get a better person for this job."
Reid warned Friday that Republicans "would not be very wise politically" to try to hold up the nomination, which last week won the support of all the Democrats and half the Republicans on the finance committee. He added that Democrats could block any attempt to filibuster.
Despite Reid's comments, several Republican lawmakers made clear Monday that they had reservations about Geithner. Sens. Saxby Chambliss of Georgia, John Thune of South Dakota and James Inhofe of Oklahoma questioned Geithner's character in light of his failure to pay some taxes earlier this decade, and his handling of questions about those missteps.
"I don't believe he has been remotely forthcoming," said Inhofe.
In congressional testimony, Geithner acknowledged having made mistakes but insisted the errors were unintentional.
Amid mounting Republican opposition to the plan, Obama is planning to ramp up his sales pitch Tuesday with a trip to Capitol Hill to meet with House and Senate Republicans in separate meetings.
Geithner will take over for Stuart A. Levey, the undersecretary for terrorism and financial intelligence, who has been serving as acting treasury secretary since the Obama administration took office last week.
- CNN's Ed Henry and Fortune's Colin Barr contributed to this report.