LONDON — Stock markets around the world have been fighting hard for the chance to handle the stock market listing of Aramco, the giant oil company owned by the Saudi Arabian government.

But the New York Stock Exchange gained an unusual public backer: President Trump.

In a speech on Sunday, Mr. Trump urged Saudi Arabia to pick the Big Board as the international venue for the initial public offering of Aramco.

“I want them to strongly consider the New York Stock Exchange or Nasdaq,” he said at Yokota Air Base after arriving in Japan for a 12-day tour through Asia.

“I just spoke to the king a little while ago, and they will consider it,” he said, referring to King Salman of Saudi Arabia.