Tech billionaires, foreign diplomats and CEOs shadowed U.S. President Donald Trump on Monday, with several attending St. John’s Church in Washington and seated prominently on the dais in the U.S. Capitol ahead of his speech.

The church service, typically a little-noticed part of Inauguration Day, quickly became a “who’s who” parade of some of the United States’ – and the world’s – wealthiest individuals, as attendees entered the downtown church near the White House. Tech executives’ embrace of Trump, including billionaires such as Elon Musk in Trump’s inner circle, has become a major theme of Trump’s transition into power, and sparked warnings from former President Joe Biden.

Musk, the world’s richest man and head of Tesla (TSLA.O), opens new tab, SpaceX and X, spent more than a quarter of a billion dollars to help elect Trump in November, and Trump has tapped Musk to lead a department aimed at creating a more efficient U.S. government.