sentences:  Economist Simon Johnson has advocated both increased regulation as well as breaking up the larger banks, not only to protect the financial system but to reduce the political power of the largest banks.One of the most vocal opponents in the United States government of the "too big to fail" status of large American financial institutions in recent years has been Elizabeth Warren.At her first U.S. Senate Banking Committee hearing on February 14, 2013, Senator Warren pressed several banking regulators to answer when they had last taken a Wall Street bank to trial and stated, "I'm really concerned that 'too big to fail' has become 'too big for trial'."