During his second term, Bush reached multiple free trade agreements and successfully nominated John Roberts and Samuel Alito to the Supreme Court. He sought major changes to Social Security and immigration laws, but both efforts failed. The wars in Afghanistan and Iraq continued, and in 2007 he launched a surge of troops in Iraq. The Bush administration's response to Hurricane Katrina and the dismissal of U.S. attorneys controversy earned wide coverage, and his second term saw a drop in his approval ratings. A global meltdown in financial markets dominated his last days in office as policymakers looked to avert a major economic disaster, and he established the Troubled Asset Relief Program (TARP) to buy toxic assets from financial institutions.