President Obama plans to convene his Cabinet for the first time today, and he will order its members to identify a combined $100 million in budget cuts over the next 90 days, according to a senior administration official....Earlier this month, both chambers of Congress passed Obama's $3.5 trillion budget outline for 2010, which includes unprecedented new investments in health care, education and energy. But the huge budget, which contemplates a $1.2 trillion deficit, has drawn the ire of small-government conservatives, who say that such high deficits jeopardize the nation's economic future.