From war hero to Trump foe. Five things to know about Robert Mueller.

The former Marine overhauled – and, supporters say, helped save – the FBI after the 9/11 attacks. Then he took on Trump in the probe of a lifetime.

​ The former Marine overhauled – and, supporters say, helped save – the FBI after the 9/11 attacks. Then he took on Trump in the probe of a lifetime. USA TODAY – Breaking News and Latest News Today Read More