Hundreds of migrants in the United States have been arrested, and others flown out of the country on military aircraft, as the White House says President Donald Trump's promised deportation operation has started.

Here’s a short list of presidents who lived elsewhere during their time in office and when the president could move into the White House.

World leaders congratulated President Donald Trump on his inauguration Monday, with many urging stronger alliances or continued cooperation between their countries and the United States, in carefully crafted social media posts and statements.