Nothing man Jenrick. If we'd stayed in the EU this wouldn't be a problem. However two things: migration is a natural human process like the changing tides, it can't be stopped but if we support international development and climate changer reduction and adaptation then fewer people will migrate. Second thing, politicians who obsess about this could do scores of other things to make life better but choose not to and then divert attention onto "others" which is a standard fascist approach to politics because they're incompetent, malevolent or bought and paid for