White House senior adviser Ivanka Trump, along with US president Donald Trump and US secretary of state Mike Pompeo, speaks to American troops at the Osan Airbase in Pyeongtaek, South Korea

Donald Trump is returning to Washington to plan for the Fourth of July after his four-day trip to Asia for the G20, which culminated in his historic crossing of the Demilitarised Zone between North Korea and South Korea at the invitation of dictator Kim Jong-un.

In doing so, Mr Trump became the first US president to step over the dividing line between the enemy states but his detractors have been quick to denounce the gesture as amounting to little more than a “photo opportunity” serving to legitimise a rogue nuclear power notorious for oppressing its people.

His daughter Ivanka has also been the victim of ridicule, cruelly mocked online for her unnecessary presence in Japan and Korea with the hashtag #unwantedivanka trending on Twitter. “Being someone’s daughter actually isn't a career qualification,” commented Democratic congresswoman Alexandria Ocasio-Cortez.

Speaking of Ms Ocasio-Cortez, the New York Democrat took a trip to migrant detention centres on Monday, where she described horrid conditions for women.

During the first stop on her voyage, Ms Ocasio-Cortez said that US Customs and Border Protection officials were physically and sexually intimidating towards her, and that migrants in the facility had been told to drink water from the toilets.

Ms Ocasio-Cortez was expected to head over to the facility in Clint, Texas, where children have been held and reportedly denied soap and toothpaste.