"Look around. You go through certain areas that didn't exist 10 or 15 years ago", he said in an interview with The Sun newspaper.
Trump told the British tabloid that "allowing the immigration to take place in Europe is a shame".
Asked whether he thought that immigration was damaging the cultural fabric of the country - the question raised in relation to comments made by the President at a North Atlantic Treaty Organisation summit on Thursday and a previous interview in the British press - President Trump said: "I think it's been very bad for Europe".
U.S. President Donald Trump and British Prime Minister Theresa May are expressing differing views on the benefits of immigration to Europe.More news: George Clooney looks in pain after motorbike crash
Trump stressed his maternal Scottish and paternal German roots, declaring: "I have a great love for the countries of Europe". So I think allowing millions and millions of people to come into Europe is very, very sad.
Standing next to May at Chequers, the prime minister's official country estate, Trump acknowledged that his remarks were "politically not necessarily correct".
Telling British and American reporters gathered in the garden at her countryside residence that the United Kingdom "has a proud history of welcoming people" and that immigration has been good for the country.
It comes after the continent's migration crisis has made headlines yet again this year as hundreds of thousands of people - mostly from Africa and the Middle East - make risky journeys to reach Europe illegally.More news: Watch NASA's iconic Cape Canaveral launch towers crumble
"I think it's changing the culture".
May says people of different backgrounds have contributed to her country's society, but it's important to have a "set of rules" when it comes to immigration. "I think they better watch themselves because you are changing culture". "I think they agree with me on immigration".
Khan said on Friday that he was "trying to rise above" the jibe, but when asked if the door of City Hall would be open to Trump if he wanted a face-to-face meeting, he added: "I'm happy to meet President Trump and to explain to him, in a respectful, courteous manner where I think he's wrong on a number of issues, to hear him out, see what his explanation is for holding me responsible for the attacks we saw in London past year".More news: How much do we really spend?
- Put The Honey Smacks Down, CDC Warns After Salmonella Outbreak
- Netflix Topples HBO in Emmy Nominations
- North Atlantic Treaty Organisation survives Trump, but the turmoil is leaving scars
- First Israeli spacecraft to land on moon next year
- Mueller Probe Brings Indictments Of Russians In Election Hacking Of Dems
- Donald Trump 'threatens to pull USA out of NATO'
- In Egypt discovered mysterious giant sarcophagus head
- Antonio Conte’s Chelsea Departure Looks Set To Turn Ugly
- Canada To Lead NATO Training Mission In Iraq
- Endangered Blue Whale Illegally Slaughtered by Icelandic Whalers, Claim Activists