President Trump takes emergency action on border wall

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President Trump has said he will use emergency powers to build a border wall with Mexico, saying "walls work". Building the wall was a key pledge of Mr. Trump's campaign but Democrats have described the move as a "gross abuse of power". Stanford economist Melanie Morton explains the economic effects of such a wall. Also in the programme, Spain's minority Socialist-led government lost the support of Catalan MPs over the budget. Our reporter in Madrid assesses whether deepening political divisions ahead of a new general election could affect the country's recovering economy. Across the UK, students have walked out of school, calling on the government to declare a climate emergency and take immediate steps to tackle it. The BBC's Frankie McCamley was at the Manchester protest. Ahead of London fashion week, Tara La Rue of the Linden Staub agency tells us why some of the models will walk away from the catwalks in debt. We travel to RAF Cranwell in Britain to find out about a new test facility to help fighter pilots cope with the negative effects of G-Force acceleration. Plus, we look back at the rest of the week's big business stories with Jessica Dye of the Financial Times and Simon Long of The Economist. And Chris Low of FTN Financial in New York gives his regular view on the US markets. Throughout the show we'll be joined by the ABC's Peter Ryan from Sydney. (Picture: U.S. President Donald Trump speaks on border security during a Rose Garden event at the White House February 15, 2019 in Washington, DC. Picture credit: Alex Wong/Getty Images)