Opera tenor Christopher Macchio will sing the national anthem at the President-elect Donald Trump's inauguration before a much smaller crowd than he was expecting, a letdown with a silver lining. The ceremony Monday has been moved indoors because temperatures are set to plummet and make it the coldest Inauguration Day in 40 years. The Capitol Rotunda holds only 600 people, while more than 250,000 guests were ticketed to view the inauguration from around the Capitol grounds.