Why Bill Ackman fears Wall Street's $30 billion rescue of First Republic could have catastrophic fallout

• Bill Ackman is sounding the alarm on Wall Street's $30 billion show of faith in First Republic.
• The billionaire investor fears the move has put other banks at risk and could endanger the economy.
• Here's why he's worried and wants a temporary blanket guarantee on bank deposits.

Bill Ackman has warned that Wall Street's rescue of First Republic threatens other banks, the financial system, and the US economy. Here's a closer look at why he's worried, and what he wants.