Presidential candidate Donald Trump's continued condemnations of former President George W. Bush's decision to invade Iraq in 2003 have irritated many of his political opponents, including Bush's younger brother and Trump's rival for the Republican nomination, former Florida Governor Jeb Bush. During the recent Republican candidates' debate in Greenville, South Carolina, Trump, in addition to calling the invasion of Iraq "a big fat mistake," responded to Jeb Bush's defense of his brother's record by reminding listeners that the 9/11 attacks had occurred while George W. was president.The heated exchange was prompted by a question posed to Trump by moderator John...