India, Sept. 25 -- Chinese President Xi Jinping broke into rare laughter during his White House tour on Thursday after US President Donald Trump pointed out a framed "autopen" displayed in place of former President Joe Biden's portrait.

The brief exchange stood out during Xi's first state visit to the United States in more than a decade.

Trump showed Xi the display while escorting him through the White House's Presidential Walk of Fame, where displays dedicated to US presidents have been installed.

Pointing towards the presidential displays, Trump said, "Trump, and then Trump -- and this is the autopen," before adding, "This is the autopen; it's Biden".

Xi responded with loud laughter, while Trump patted the Chinese leader on the arm,...