Warren Buffett, the largest shareholder at Wells Fargo, calls on the US bank to look outside Wall Street for a new chief executive, Saudi Aramco attracts nearly $30 billion for an upcoming international bond sale and Kirstjen Nielsen, the US secretary of homeland security, resigns from her post. Plus, the FT’s political editor George Parker talks about the upcoming week in British politics ahead of the EU's emergency Brexit summit. See acast.com/privacy for privacy and opt-out information.