US President George W. Bush said in an interview set for broadcast Monday that he came to office “unprepared for war” and that his “biggest regret” was the US “intelligence failure” on Iraq. In a wide-ranging exchange with ABC television's “World News Tonight,” Bush also said he was “sorry” that the global economic meltdown was taking place and predicted that he would leave office January 20th with his “head held high.” The US president has been mired in record-low approval ratings after the botched government response to killer Hurrican Katrina (2005) and amid wars in Iraq and Afghanistan, as well as the world financial crisis. “The biggest regret of all the presidency has to have been the intelligence failure in Iraq,” Bush said 50 days before president-elect Barack Obama's inauguration. “I wish the intelligence had been different, I guess.” But Bush refused to say whether he would have ordered the March 2003 invasion if he had known that late dictator Saddam Hussein did not have weapons of mass destruction, calling it “an interesting question.” “That is a do-over that I can't do. It's hard for me to speculate,” said Bush, who declared as recently as last week that Saddam's ouster was “the right decision then – and it is the right decision today.” More than 4,200 US troops have died in Iraq since Bush launched the war after a months-long public campaign centered on the charge – later proved false – that Saddam possessed vast stockpiles of weapons of mass destruction. “A lot of people put their reputations on the line and said the weapons of mass destruction is a reason to remove Saddam Hussein. It wasn't just people in my administration,” Bush told ABC. Asked what his greatest accomplishment was, the US president replied: “I keep recognizing we're in a war against ideological thugs and keeping America safe.” Asked what he was most unprepared for when he took office in Jan. 2001, Bush replied: “I think I was unprepared for war. In other words, I didn't campaign and say, ‘Please vote for me, I'll be able to handle an attack.'” “In other words, I didn't anticipate war. Presidents – one of the things about the modern presidency is that the unexpected will happen,” he said. Bush, whose administration recently accepted a formal timeline for withdrawing from Iraq, also stood fast behind his refusal for years to set a pull-out timetable. “It would have compromised the principle that when you put kids into harm's way, you go in to win,” he said. __