Donald Trump has fired his controversial US homeland security secretary, Kristi Noem, after weeks of bipartisan complaints about her leadership. As the public face of an aggressive immigration crackdown that prompted lawsuits and nationwide anti-ICE protests, Noem’s year-long tenure was plagued by multiple controversies, including accusing two US citizens killed by immigration agents of ‘domestic terrorism’. What exactly led to Noem’s firing and what do we know about her replacement? Nosheen Iqbal speaks to the Guardian US live news editor Chris Michael – watch on YouTube. Help support our independent journalism at theguardian.com/infocus