The billionaire real estate tycoon also told CNN's "State of the Union" talk show that the Middle East "blew up" around US President Barack Obama and former secretary of state Hillary Clinton, his biggest Democratic rival in the race for the White House.
"100 per cent," Trump said when asked if the world would be better off with Hussein and Kadhafi still at the helm in Iraq and Libya.
Kadhafi -- who ruled Libya for four decades -- was ousted and slain in October 2011.
"People are getting their heads chopped off. They're being drowned. Right now it's far worse than ever under Saddam Hussein or Gaddafi," Trump said.
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"If you look at Iraq from years ago, I'm not saying he (Saddam) was a nice guy. He was a horrible guy but it's better than it is now," Trump said.
Trump said his foreign policy strategy would be centered around beefing up the US military.
"All I know is this: we're living in Medieval times ... We're living in an unbelievably dangerous and horrible world," Trump said.
"The Trump doctrine is simple," he added. "It's strength. It's strength. Nobody is going to mess with us. Our military will be made stronger.