By Steve Holland and Tim Reid WASHINGTON (Reuters) -Thousands of Donald Trump's supporters packed a Washington arena on Sunday to celebrate his victory, a day before the president-elect returns to power with plans to aggressively reshape U.

On the eve of his scaled-down second inauguration, President-elect Donald Trump vowed to quickly close the southern border, deport millions of undocumented immigrants and sign a litany of other executive orders when he returns to power on Monday.

The campaign-style rally was a break with tradition for presidents, who have sought to reserve their comments for the official inauguration speech.