'Closer to the bullseye': How damning is Michael Flynn's guilty plea for Trump?

This week former US national security advisor Michael Flynn pleaded guilty to lying to the FBI, about conversations with the Russian ambassador to the US, but just how significant is the guilty plea from the former US national security adviser, and what could it mean for the Trump administration?

Michael Flynn and Jared Kushner attend a press conference in Washington DC. January 2017. Source: AAP