Trump meets new Japan Emperor Naruhito

US President Donald Trump and first lady Melania Trump are on a four-day trip to Japan. (AAP)

US President Donald Trump and first lady Melania Trump have met newly enthroned Japanese Emperor Naruhito and Empress Masako in Tokyo.

US President Donald Trump has been given the red carpet treatment at Japan's Imperial Palace, where he made history by becoming the first world leader to meet with the new emperor of Japan.

Emperor Naruhito ascended to the throne on May 1, opening what is called the era of "Reiwa," or "beautiful harmony." Trump and first lady Melania kicked off the formal visit with greetings with Naruhito and Empress Masako.

The president, who is on a four-day state visit to Japan, was treated to a welcome ceremony full of pomp and pageantry. On a hot, sunny day, Trump stood at attention alone atop a platform before he walked along a red-carpeted route to review troops. Military bands played and Trump passed in front of a group of schoolchildren feverishly waving US and Japanese flags.

Trump later will go to the Japanese state guest house for meetings, a working lunch and joint news conference with Japanese Prime Minister Shinzo Abe.

The couple is also invited to a state banquet at the palace in the evening.

Trump's talks with Abe are likely to be centred upon trade and North Korea. Trump has repeatedly criticised Japan for its chronic trade surplus with the US, threatening to slap tariffs on Japanese cars and car parts.

But he claimed on Sunday that "great progress" had been made in trade talks.

"Great progress being made in our Trade Negotiations with Japan. Agriculture and beef heavily in play," Trump tweeted, having previously urged Abe to open the country's automotive and agriculture markets.

On Sunday, Trump and Abe played golf and watched a sumo wrestling match at the Ryogoku Kokugi-kan, where the president presented a special US-made trophy to rank-and-file wrestler Asanoyama, the winner of the Summer Grand Sumo Tournament in Tokyo.

With AP

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