The run-up to the coming US elections has seen an America more divided than ever before. As President Trump seeks re-election, national security observers in America watch the rise of the far-right with alarm and say politics, conspiracy and extreme right-wing ideology are all stirring the pot of violence. So much so that a domestic terrorist threat from the far-right has overtaken most other national security concerns at the moment. How will this play out between now and November? And what could happen even after the results of this bitterly contested election are out? Maya Mirchandani speaks to Colin Clarke, the national security expert at the Soufan Centre and Professor at Carnegie Mellon University.