Too busy for President Trump?

Watch the 11-year-old boy who didn't realise America's President Trump was right behind him.

Frank had written to the president asking if he could mow the lawn at the White House and he got his wish.

But Frank was so busy doing his work and the lawnmower was making so much noise, that at first he didn't even realise Donald Trump had come up to him for a handshake!

Watch this!