First Republic Bank ($FRC@US) surged more than 20 percent in premarket trading on Tuesday following remarks by Treasury Secretary Janet Yellen indicating that the government could backstop deposits at additional banks. The Treasury Department is also exploring whether Regulators possess the authority to provide temporary deposit insurance beyond the current Federal Deposit Insurance Corporation without the approval of Congress. First Republic shares have dived 90 percent since Silicon Valley Bank’s swift collapse began on March 8th. The SPDR S&P Regional Banking ETF, which declined 29 percent in March, gained 3.3 percent in early trading.