White House officials said Thursday that the session was added to Sunday's schedule at the last minute at Trump's request.
Trump insists the U.S. economy is strong despite fears that a recession may be on the horizon. At the same time, global economic growth has slowed due to weakness in Germany, Europe's largest economy, and a pronounced slowdown in China, the world's second-largest economy, as it remains locked in a tense trade standoff with the U.S.
The dour global outlook is partly a reflection of Trump's combative approach to trade with China and other nations he has hit or threatened to hit with tariffs.
Leaders are to meet at an informal dinner Saturday, where they are expected to discuss foreign policy and security issues before more formal working sessions Sunday and Monday.
Trump is also scheduled to meet on the sidelines of the summit with several world leaders, including French President Emmanuel Macron, Japanese Prime Minister Shinzo Abe, Indian Prime Minister Narendra Modi, German Chancellor Angela Merkel and Canadian Prime Minister Justin Trudeau.
Boris Johnson, Britain's new prime minister, will also have his first face-to-face meeting with Trump, a personal friend, since taking office a few weeks ago.
The tax is designed to keep multinational corporations from avoiding taxes by setting up European headquarters in low-tax European countries. Currently, companies such as Google, Amazon, Facebook, Apple, Airbnb and Uber pay very little tax on their significant business in countries like France.
The Trump administration says the tax is discriminatory against U.S. business.