Trump railed against illegal immigration to win the 2016 US presidential election and has seized on the caravan of Central American migrants at campaign rallies in the run-up to next week's vote, firing up support for his Republican Party.
Trump kicked off his second day on the subcontinent with an elaborate outdoor welcome ceremony in front of the grand Rashtrapati Bhavan Presidential Palace, continuing the pomp and pageantry the Indian government had lavished on Trump a day earlier.
Trump's arrival in London came the day after the US Ambassador in London, Woody Johnson, gave an interview to the BBC on the topic of future trade relations, and when asked about American interest in Britain's free at point of use National Health Service, said "I think probably the entire economy would in a trade deal, all things that are traded would be on the table," provoking public outrage.
Trump said in late April that Singapore and the Demilitarized Zone on the Korean Peninsula could be where he would meet with Kim, but on Wednesday he ruled out the Demilitarized Zone.
Trump traveled to California on Monday to inspect the situation there, denying the role of climate change in the wildfire that blocked the sun and turned the sky red.
Trump, 71, is the oldest US president at this point in his tenure and has faced questions about his health.
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Trump's campaign has so far declined to announce the president's defeat to his rival, former vice President Democrat Joe Biden, saying a large number of mail-in ballots were cast illegally.
Trump said on Wednesday that his second conversation with Putin was an exchange of "pleasantries" that lasted 15 minutes.
Trump tweeted that the two men discussed Ukraine but has not mentioned a referendum or revealed specifics of the Ukraine discussions.
Trump's tariffs have drawn sharp criticism from many experts in the US. The Washington-based Cato Institute ran a series of articles over the past few days by its economists and trade experts titled: Trump trade tariffs are a wanton act of economic self-destruction.