Republican presidential nominee Donald Trump said Tuesday that President Barack Obama was "the worst president, maybe in the history of our country" after Obama called Trump "unfit to serve" and "woefully unprepared to do this job" earlier in the day. “I think the Republican nominee is unfit to serve as president,” Obama said, adding, “He keeps on proving it.”The president questioned whether Trump has “basic knowledge” on key issues. "I think he's been a disaster. He's been weak, he's been ineffective," Trump said on Fox News' "The O'Reilly Factor." "She is reckless with her emails, reckless with regime change, and reckless with American lives,” Trump said.

Source: Fox News August 03, 2016 00:58 UTC