Analysis

From a US president who is turning the world upside down – with a relish for dismantling global agreements – the message is clear: it’s America first. But where does that leave old European allies? Few expect the transatlantic relationship to go back to where it was before Trump. Europe, says Angela Merkel, now has to shape its own destiny. James Naughtie explores the uncertain future for America's friends. Producer: Kate Collins

Republican insider Ron Christie discovers how Donald Trump's presidency is changing his party. Trump arrived in the White House offering a populist revolt in America, promising to drain what he calls "the swamp that is Washington D.C". So what does his own Republican Party - traditionally a bastion of the nation’s establishment - really make of him? Where is he taking them and what will he leave behind? Christie, a long-time Republican who has served in the West Wing under George W Bush, takes us on a journey behind the scenes to meet Trump’s inner circle - including figures like Mercedes Schlapp, White House director of strategic communications, and to influential conservative broadcaster Sean Hannity. He talks to the supporters and the sceptics alike who watch in amazement as one of the most controversial presidents of all time takes his country and his party by storm. Producer: Kirsty Mackenzie

What could cause a future financial crash? Ian Goldin, professor of globalisation and development at Oxford University, talks to some of the world's leading economists about whether we have learnt lessons from the 2008 financial crash and whether countries are now better prepared to meet the next crisis. Or are we condemned to another economic meltdown, perhaps even more severe, which would provide new fuel to the fires of populism? A decade ago, the world was taken by surprise. Will it be again? Featuring contributions from the IMF's Managing Director, Christine Lagarde, Lord Nick Stern, Professor Peter Piot, Pascal Lamy and Jeffrey Sachs. Producer: Ben Carter

Many key findings in psychological research are under question, as the results of some of its most well-known experiments – such as the marshmallow effect, ego depletion, stereotype threat and the Zimbardo Stanford Prison Experiment – have proved difficult or impossible to reproduce. This has affected numerous careers and led to bitter recriminations in the academic community. So can the insights of academic psychology be trusted and what are the implications for us all? Featuring contributions from John Bargh, Susan Fiske, John Ioannidis, Brian Nosek, Stephen Reicher, Diederik Stapel and Simine Vazire. Presenter David Edmonds Producer Ben Cooper

How many democracies around the world are gradually being dismantled. Democracies today are less and less likely to be overthrown in violent coups. Today’s methods of establishing one party rule are much more subtle and insidious. Political scientist Professor Matt Qvortrup explores how the modern authoritarian leader takes control of his or her country. High on their list will be subtly manipulating elections to win with a comfortable but credible majority: appointing their own supporters to the judiciary whilst watering down their powers: silencing critics in the press while garnering positive coverage from their media supporters: punishing opponents by denying them employment while rewarding lackeys with key positions. And using technology to help rig votes and spread propaganda. Matt traces these methods back to Roman times while looking at their contemporary relevance in countries as diverse as Kenya, Poland, Hungary, and Venezuela. Producer: Bob Howard