Trump arrived in Britain on Monday and was greeted by Queen Elizabeth II at Buckingham Palace at the beginning of his first day in the country, during which he is also scheduled to lay a wreath in Westminster Abbey.
Trump's first official visit to Britain previous year was also marked by criticism of May's Brexit strategy and large protests.
Scotland Yard placed streets surrounding Buckingham Palace and Downing Street in lockdown, with around 10,000 police officers deployed in the capital in a £25 million operation.
State broadcaster the BBC also invited a smaller replica of the balloon into its studios Monday.
The Trumps had lunch with the Queen and were shown around a collection of items with significance for the US. Of course, it was a special moment for the Duchess, too, as it was her first time wearing her new insignia as a Dame Grand Cross of the Royal Victoria Order (GCVO) - a new title that was gifted to her by the Queen in May.
Upon arrival, Trump received a royal salute and made his way to Buckingham Palace to meet with Queen Elizabeth II and other members of the royal family-with the exception of Markle, who is looking after her newborn son. Trump and Charles wore suits. He appeared to get on with the Prince of Wales, whose views on climate change could have set the two men on a...
The first day of such a visit is customarily taken up with a series of royal engagements and ceremonies. He said that the so-called "special relationship" between the US and Britain had helped ensure the "safety and prosperity of both our peoples for decades". "The bond between our nations was forever sealed in that great crusade".
"As we honour our shared victory and heritage, we affirm the common values that will unite us long into future", he said at the banquet.
Iran president says Islamic Republic won't be 'bullied' into USA talks
Last month, Iran partially suspended its commitments under the 2015 deal on its nuclear programs, known as the JCPOA. But Zarif warned that "there will be consequences" if the USA continues adding more economic sanctions.
Mayor Bill de Blasio and the mayor of London slapped back at President Trump on Monday after the commander-in-chief compared the two, saying Sadiq Khan reminds him of our "dumb and very incompetent" mayor of NY. On Sunday, Mr Trump denied calling the duchess "nasty", despite him using the word on tape.
But Trump has also gone to bat for former mayor of London Boris Johnson, who's now seeking the top job despite a checkered history.
Responding to Trump's latest criticism of the London mayor, Khan's spokesman said: "This is much more serious than childish insults which should be beneath the President of the United States".
London Mayor Sadiq Khan blasted Trump and Britain's red carpet welcome ahead of his trip, comparing Trump and other far-right heads of state to fascist leaders of the 20th century.
Et tu, Theresa? Outgoing Prime Minister May is more likely now to freely speak her mind around Trump, given that she only has a few days left in office.
British Prime Minister Theresa May has undergone months of political turmoil over Britain's planned exit from the European Union, and French President Emmanuel Macron is expected to use the 75th anniversary of the World War II battle that turned the tide on the Western Front to call for strengthening multinational ties the USA president has frayed.