WASHINGTON — The political pressure to enact financial reform intensified Friday as the government accused Goldman Sachs Group Inc. of defrauding investors and the Senate concluded two days of hearings highlighting the assertedly lax supervision that preceded the largest bank failure in the country's history.

The mere suggestion of further impropriety at a Wall Street firm, coupled with intense hearings that laid bare regulators' unwillingness to rein in risky lending practices at Washington Mutual Inc. could significantly hamstring Republican efforts to oppose or weaken a reform bill.

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