Donald Trump’s improbable-then-unstoppable run for the presidency takes its last, formal step Monday as the electoral college meets to officially seal his victory.

The usually overlooked, constitutionally obligated gathering of 538 electors in 50 states and the District of Columbia has earned special scrutiny and intense lobbying this year by Trump’s opponents, including last-minute weekend protests in cities such as Denver and Los Angeles after the split election.

Voting began Monday morning in several states, including Arkansas, Illinois, Indiana and New Hampshire, with electors in other states scheduled to meet at various times until 5 p.m. Eastern. Results will be officially announced on Jan. 6 in a special joint session of Congress/Washington Post. More here.