Greta Thunberg delivered a powerful speech at the UN Climate Action Summit in New York yesterday, but there has been a continued backlash from some quarters.

Fox News was forced to apologise for a guest's remarks about the teenager, as right-wing commentator Michael Knowles referred to Thunberg as a "mentally ill Swedish child".

He was immediately challenged by fellow guest Christopher Hahn, who criticised Knowles for "attacking a child".

Fox News subsequently described the comments as "disgraceful".

Cal Thomas and Larry Donnelly joined us for our US slot to discuss this story and more, including claims that Donald Trump asked the president of Ukraine to investigate Joe Biden and his son.

Listen to the interview in full by pressing the play button on this page.