"I think Boris is very capable and I think he'll do a good job", Trump said in London, where he is attending a meeting of North Atlantic Treaty Organisation leaders.
"So the reality is the evidence is there and the anxiety that we have about the NHS under a Boris Johnson regime and his relationship with Trump causes us extreme concern". "Never even thought about it honestly", said Trump, who is in Britain for the North Atlantic Treaty Organisation summit.
Johnson's Conservatives are leading opinion polls, but the rival Labour party has sought to whip up public opinion against Trump, who is deeply unpopular in Britain. The US leader has been outspoken in his support for Britain's looming exit from the European Union, which Johnson has promised to deliver in January after years of turmoil.
Labour and campaign groups have accused the government of plotting to sell off the health service as part of a future trade deal with the US.
Jay-Z marks 50th birthday by adding his music on to Spotify
In a Twitter announcement Wednesday, Spotify wished the rapper a happy birthday and welcomed him back to the streaming service. When music streaming started picking up steam in the middle of the decade, Jay-Z didn't want to be left behind.