TOKYO (AP) — President Donald Trump begins one of his busiest days of his Asia trip on Tuesday, meeting with the new Japanese prime minister, speaking to U.S. troops aboard an aircraft carrier and mingling with business leaders.

Though Trump is visiting one of America’s most steadfast allies in Asia, there’s considerable uncertainty while he’s there. Sanae Takaichi, Japan’s first female prime minister who took office just days ago, must solidify her relationship with Trump while defending her country’s economic interests. Trump aims for $550 billion in Japanese investment as part of a trade deal that would reduce U.S. tariffs.

In an effort to charm, Takaichi may discuss purchasing Ford F-150 trucks, addressing Trump’s contention that Japan doesn’t buy American vehicles, which are often impractical on Japan's narrow streets.

Despite a primarily tariff-focused relationship, Trump will also speak aboard the USS George Washington, docked near Tokyo, showing America's military commitment to the region. Trump arrived in Tokyo after ceremonial meetings with the emperor and participation at the ASEAN summit in Malaysia.

In addition, this gathering follows Trump’s push for a ceasefire agreement between Thailand and Cambodia, as tensions ease between the U.S. and China with reports of a forthcoming trade agreement. Trump is scheduled to leave for South Korea on Wednesday for the Asia-Pacific Economic Cooperation summit.