Hours into his second term as president, Donald Trump signed an executive order renaming Denali, the tallest mountain in the US, to Mount McKinley in honour of former President William McKinley. Here's everything you need to know about the Republican president, who served for just under five years before he was assassinated.

The tallest peak in North America has been named Denali since 2015 when its name was officially changed under former President Barack Obama.

The move is likely to face some pushback in Alaska, where the Alaska Native name has long been favored for the continent’s tallest mountain.