"A government of laws, not men." That message blazed across the US Department of Justice headquarters in Washington DC on Tuesday, casting a sharp rebuke in light against one of the most powerful buildings in the country. The words, drawn from founding father John Adams, were projected above a banner of US President Donald Trump that has hung from the building for months. Washington has hardly been quiet since Mr Trump returned to the White House last year, and the capital has become familiar terrain for demonstrations of…