Representational image TOI correspondent from Washington: Every party has uninvited guests and on America's 250th birthday bash, they arrived in matching khakis, face masks, dark glasses, and military-style formation.Hours before President Trump extolled the virtues of liberty, democracy and the American experiment in his speech, roughly 400 members of the white nationalist group Patriot Front marched through downtown Washington carrying modified American flags and banners proclaiming "Reclaim America."Patriot Front, one of the country's best-known white supremacist organizations, traces its roots to the extremist movement that emerged after the 2017 Charlottesville rally. Uniformed in khakis, navy shirts and white face coverings,...