James Cleverly also discussed progress in trade negotiations with India and defended the government's position on China.
"We have got to recognise that sometimes his particular style can be surprisingly effective," he said.
There were other times Mr Trump was less successful, of course, such as the lack of progress in peace negotiations on the Korean peninsula, despite becoming the first US sitting president to meet a North Korean leader and the first since the Korean War to set foot in the country's territory.
But he added:"From the UK's point of view, we're going to stick with what we've seen to be effective, which is not a quick or easy result."Donald Trump says he does not think about going to jail over election interference charges.
Mr Cleverly would not go into detail on whether he has warned India against targeting British citizens but said the UK has"sensitive, difficult conversations" with India, and added:"We have a duty to protect the citizens of this country and people living here and we take that incredibly seriously. That is an absolute."
He said he remains hopeful for a trade deal, saying"we have been making fantastic ground" and"very good progress".
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