President Obama on Monday gathered together every confirmed member of his Cabinet for the first time as president and challenged them to cut $100 million in the next 90 days. President Obama meets Monday with his Cabinet, including Defense Secretary Robert Gates, right. Agencies will have to report how they saved on expenses at the end of the period. The federal government has a confidence gap when it comes to the American people, Obama said at the White House. We 've got to earn their trust. They 've got to feel confident that their dollars are being spent wisely. The edict is part of Obama's commitment to go line by line through the budget to cut spending and reform the government, a senior administration official said. One potential Cabinet officer was missing from the meeting -- Kansas Gov. Kathleen Sebelius, the health and human services secretary-designate. The Senate has not voted on whether to confirm Sebelius to the post. Obama made his savings request as the House of Representatives and Senate were returning from recess this week, ready to start reconciling their versions of the fiscal 2010 budget resolution. The president's budget request is $3.67 trillion. Watch how the administration hopes to cut costs In the context of the federal budget, $100 million in savings is a small amount, critics said. Any amount of savings is obviously welcome, Senate Minority