内容摘要：The current record holder is the late Valery Rozov, who jumped 7,700m (25,300ft) from Cho Oyu in 2016.

The current record holder is the late Valery Rozov, who jumped 7,700m (25,300ft) from Cho Oyu in 2016.

Mr Prakash said that while the president can order employees of federal agencies to interpret citizenship more narrowly - agents with the US Immigration and Customs Enforcement, for example - that would trigger legal challenges from anyone whose citizenship is denied.The Trump administration's arguments rest on the clause in the 14th Amendment that reads "

It argues that the language excludes children of non-citizens who are in the US unlawfully.Courts have generally disagreed. In Plyler v Doe, a 1982 Supreme Court case involving a different part of the 14th Amendment,that undocumented immigrants were not "persons within its jurisdiction". The court ruled that migrants are both subject to US laws and granted the protections afforded by them.

A constitutional amendment could do away with birthright citizenship, but that would require a two-thirds vote in both the House of Representatives and the Senate and approval by three quarters of US states - a virtual impossibility on such a controversial proposal, given the current finely balanced divide in American politics., about 250,000 babies were born to unauthorised immigrant parents in the United States in 2016, which is a 36% decrease from a peak in 2007. By 2022, the latest year that data is available, there were 1.2 million US citizens born to unauthorised immigrant parents, Pew found.

But as those children also have children, the cumulative effect of ending birthright citizenship could potentially increase the number of unauthorised immigrants in the country to 4.7m in 2050, the Migration Policy Institute, a think tank, found.

In an interview with NBC's Meet the Press, Trump said he thought the children of unauthorised immigrants should be deported alongside their parents - even if they were born in the US.Supporters of birthright citizenship point out that it has been the law of the land for well over a century and that

a "permanent subclass of people born in the US who are denied full rights as Americans."The concept of birthright citizenship, also known by the legal term "jus soli", is based in English common law and was generally accepted to apply to white men throughout early American history.

However, it did not become part of the Constitution until 1868, when the 14th Amendment was passed in the wake of the US Civil War in order to settle the question of the citizenship of freed, American-born former slaves.Previous Supreme Court cases, like Dred Scott v Sandford in 1857, had determined that African Americans could never be US citizens. The 14th Amendment overrode that.