The demonstrators, holding signs and chanting slogans, denounced the Trump administration’s policies, its handling of foreign relations, and what they described as threats to democracy.

Even before President Trump took the podium to address a joint session of Congress on Tuesday, Democrats began disrupting the proceedings. Within minutes, a lawmaker was escorted out of the chamber. Why it matters: The Democratic protests from inside the chamber represent an unprecedented level of coordination that reflects the immense grassroots pressure the party is facing to mount a resistance to Trump.