By bizn_fun 
No 10 also pointed out the US president was due in China himself in April.
The US president was asked by a reporter: “What do you think about the UK going into business with China?”
Beyond his brief comments, Trump did not say anything further about the UK’s engagement with China, pivoting instead to Canada and delivering a similar warning.
He said it was “even more dangerous, I think, for Canada”.
“Canada is not doing well. They’re doing very poorly, and you can’t look at China as the answer,” he added.
Earlier this week, the US president threatened to impose tariffs on Canada if it went through with economic deals struck with China on a recent visit to Beijing by its Prime Minister, Mark Carney.
The comments come after Sir Keir said the UK’s relationship with China was in a “good, strong place” following his talks with Xi at the Great Hall of the People on Thursday.
Sir Keir said on Friday that the “very good meetings” with Xi had provided “just the level of engagement that we hoped for”.
“We warmly engaged and made some real progress, actually, because the UK has got a huge amount to offer,” he told a meeting of the UK-China Business Forum at the Bank of China in Beijing.
So far several things have come out of Sir Keir’s trip including an agreement on visa-free travel and lower whisky tariffs, as well as a £10.9bn investment by AstraZeneca to build manufacturing facilities in China.
Agreements on further co-operation in other areas such as organised crime and illegal immigration were also announced.