Build a wall became a central slogan of Donald Trump's 2016 presidential campaign, referring to his proposal for a barrier along the United States and Mexico border. The phrase was repeated at rallies and in speeches, reported widely in the news, and quickly turned into a meme online. Short clips circulated on soundboards and social media, often detached from policy debates and used for humour. Its continued use comes from how recognisable and quotable the short line remains across political satire and reaction content today.