Some of the most exclusive seats at President Donald Trump’s inauguration were reserved for powerful tech CEOs who also are among the world’s richest men.

The swearing-in ceremony in Washington, moved indoors due to glacial temperatures, is being attended by former presidents, foreign dignitaries, tech and business executives, and an assortment of performers and celebrities.

Top tech billionaires including some who were critics of Trump during his first term flock to his inaugural celebrations.