WASHINGTON (CNN) -- Promising "a new era of openness in our country," President Barack Obama signed executive orders Wednesday relating to ethics guidelines for staff members of his administration.

"Transparency and the rule of law will be the touchstones of this presidency," Obama said.

Among other things, Obama said he would issue a pay freeze for his senior staff.

The new president has also promised swift action on the beleaguered economy. House Democrats, at Obama's urging, have signed a $825 billion economic recovery package that the president says will save or create up to 4 million jobs and invest in health care, energy and education.

House Republican leaders, however, asked to meet with Obama on Thursday to offer major changes to the recovery proposal.

"The challenge as we see it is to create a plan that helps middle-class taxpayers and small businesses without wasting money or exploding our national deficit," the leaders wrote in a letter to the new president.

Rep. Paul Ryan, the top Republican on the House Budget committee, argued that the main tax provision in the Democrats' plan -- cutting payroll taxes -- was not an effective way to jump-start the economy.

House Republican Conference Chairman Mike Pence declined to say whether the Democrats' package would get any Republican support if it didn't change significantly.

Obama began his first full day in office with a moment of solitude in the Oval Office, reading a note from his predecessor, before making phone calls to Middle East leaders.

Obama arrived in the Oval Office and spent 10 minutes alone, reading a note left for him in the desk by outgoing President George W. Bush.

White House Chief of Staff Rahm Emanuel met with the president 10 minutes later to discuss the daily schedule, Gibbs said.

Obama called Middle East leaders, including King Abdullah of Jordan, Israeli Prime Minister Ehud Olmert, Palestinian Authority President Mahmoud Abbas and Egyptian President Hosni Mubarak, Gibbs said.

On Sunday, Israel and Palestinian militants declared a cease-fire after 22 days of fighting in Gaza.

First lady Michelle Obama joined her husband in the Oval Office at 9:10 a.m., shortly before the first couple departed for the National Prayer Service at the Washington National Cathedral.

Later in the day, Obama is expected to meet with his economic team and top brass from the Pentagon. iReport.com: What do you think Obama should do first?

He plans to tell the top U.S. officers that he wants them to plan to have combat forces out of Iraq in 16 months, as he promised during his election campaign, an adviser said.

"It's something he still believes is a responsible timetable," White House adviser David Axelrod told CNN. "But they'll discuss it. Everyone agrees that we need to be on a pace to withdraw our troops, and how that will be implemented I'm sure will be something he'll discuss."

Gen. David Petraeus, whose command oversees U.S. troops in Iraq and Afghanistan, is expected to attend the meeting, CNN learned Tuesday. Petraeus, who will have just arrived from Afghanistan and Pakistan, is expected to brief Obama on the latest developments in the troubled region.

Obama's administration was already in action Tuesday, ordering a 120-day halt to prosecutions of suspected terrorists at the U.S. prison camp at Guantanamo Bay, Cuba, to review the military commissions that try them.

Papers filed at the U.S. prison camp said the request is made "in the interest of justice and at the direction of the president of the United States."

The president also is expected to order a reversal of the Bush administration's so-called "Mexico City" policy, which prohibits U.S. money from funding international family planning groups that promote abortion or provide information, counseling or referrals about abortion services.

Chief of Staff Emanuel sent a memo to all federal agencies and departments to halt consideration of pending regulations throughout the government until the new staff can examine them, White House officials told CNN.

WASHINGTON — President Barack Obama's first public act in office Wednesday was to institute new limits on lobbyists in his White House and to freeze the salaries of high-paid aides, in a nod to the country's economic turmoil.

Announcing the moves while attending a ceremony in the Eisenhower Executive Office Building to swear in his staff, Obama said the steps "represent a clean break from business as usual."

The pay freeze, first reported by The Associated Press, would hold salaries at their current levels for the roughly 100 White House employees who make over $100,000 a year. "Families are tightening their belts, and so should Washington," said the new president, taking office amid startlingly bad economic times that many fear will grow worse.

Those affected by the freeze include the high-profile jobs of White House chief of staff, national security adviser and press secretary. Other aides who work in relative anonymity also would fit into that cap if Obama follows a structure similar to the one George W. Bush set up.

Obama's new lobbying rules will not only ban aides from trying to influence the administration when they leave his staff. Those already hired will be banned from working on matters they have previously lobbied on, or to approach agencies that they once targeted.

The rules also ban lobbyists from giving gifts of any size to any member of his administration. It wasn't immediately clear whether the ban would include the traditional "previous relationships" clause, allowing gifts from friends or associates with which an employee comes in with strong ties.

The new rules also require that anyone who leaves his administration is not allowed to try to influence former friends and colleagues for at least two years. Obama is requiring all staff to attend to an ethics briefing like one he said he attended last week.

Obama called the rules tighter "than under any other administration in history." They followed pledges during his campaign to be strict about the influence of lobbyist in his White House.

"The new rules on lobbying alone, no matter how tough, are not enough to fix a broken system in Washington," he said. "That's why I'm also setting rules that govern not just lobbyists but all those who have been selected to serve in my administration."

In an attempt to deliver on pledges of a transparent government, Obama said he would change the way the federal government interprets the Freedom of Information Act. He said he was directing agencies that vet requests for information to err on the side of making information public _ not to look for reasons to legally withhold it _ an alteration to the traditional standard of evaluation.

Just because a government agency has the legal power to keep information private does not mean that it should, Obama said. Reporters and public-interest groups often make use of the law to explore how and why government decisions were made; they are often stymied as agencies claim legal exemptions to the law.

"For a long time now, there's been too much secrecy in this city," Obama said.

He said the orders he was issuing Wednesday will not "make government as honest and transparent as it needs to be" nor go as far as he would like.

"But these historic measures do mark the beginning of a new era of openness in our country," Obama said. "And I will, I hope, do something to make government trustworthy in the eyes of the American people, in the days and weeks, months and years to come."