(NECN: Peter Howe) - One of New England's preeminent bankers, Charles K. "Chad" Gifford, was on the hot seat Tuesday in Congress, facing a grilling over Bank of America's $50 billion takeover of Merrill Lynch last year. Some of the toughest questioning: about freshly disclosed, blunt e-mails Gifford privately sent family and friends bemoaning the Merrill deal and saying Bank of America had been strongarmed by the government to complete it during last fall's market meltdown.