King Charles has written to US President Donald Trump to congratulate the country on the 250th anniversary of the Declaration of Independence.The King also reminded the president of 'our shared responsibility to protect the natural world' after Mr Trump's opposition to net zero policies.Mr Trump's team has reportedly warned against appointing Energy Secretary Ed Miliband as Chancellor because of his opposition to new North Sea drilling licences.Charles wrote that he and Queen Camilla were 'delighted to send our warmest congratulations to you and to the people of the United States of America on the occasion of the 250th anniversary of your nation's independence'.The Royal couple visited the US in April to mark the milestone, travelling to Washington, New York and Virginia during the four-day State Visit.Their schedule ranged from taking tea at the White House with Mr Trump and his wife Melania, a white-tie banquet in their honour and a bunting-decked street party in rural Virginia. As part of the visit Charles addressed the US Congress, only the second time a British monarch has done so after Queen Elizabeth II in 1991.His remark that executive power being 'subject to checks and balances' was a British legal tradition enshrined in Magna Carta was seized upon as a warning to Trump. King Charles wrote to US President Donald Trump congratulating his country on the 250th anniversary of the Declaration of Independence The Royal Family posted a congratulatory message signed by the King on Instagram Charles travelled with Queen Camilla to the US earlier this year for a historic four-day State VisitLast September, Mr Trump came to the UK for a historic second State Visit. Charles's letter to the president today echoed his message of partnership and unity which he delivered to Congress, branding the relationship between the UK and the US 'one of extraordinary evolution'. 'From overcoming conflict to forging one of the closest and most productive alliances the world has seen,' the King said the ties between the two countries were 'unique and far-reaching'.He added: 'Together, we face the challenges of today, and the opportunities of tomorrow.'Referencing his speech to Congress, Charles said: 'Our shared roots run deep, and they are still vital.'He continued: 'I am greatly encouraged by the enduring bond between our countries, and by the many connections between our peoples, which we were able to see once again, at first-hand, on our visit.'Through centuries of shared challenge and achievement, our nations have built a relationship founded on friendship, trust and a belief in liberty, the rule of law and the dignity of all people.'Looking ahead to the next 250 years, Charles said he had 'no doubt' the two countries would 'continue to defend our shared values'.He continued: 'I also hold a deep appreciation of our shared responsibility to protect the natural world, knowing the decisions we take today will determine whether our critical natural systems will not just maintain the harmony and essential diversity of Nature, but also continue to provide the foundation for our prosperity and our national security for both present and future generations.'Mr Trump has described Britain's net zero policies as 'stupid' and railed against the 11 wind turbines built near his Aberdeenshire golf course, describing them as 'some of the ugliest you've ever seen'. Greenpeace activists staged a protest at Mr Trump's Turnberry golf club in Aberdeenshire earlier this year after the president railed against wind turbines near the courseIt was reported today that high-ranking US officials have warned their UK counterparts and senior Labour figures about appointing Energy Secretary Ed Miliband as Chancellor.Mr Miliband is thought to be the frontrunner to reach No.11 when, as is most likely, Andy Burnham becomes Prime Minister later this month.The former Labour leader reportedly believes new drilling for oil and gas in the North Sea would offer relatively little economic benefit and do significant damage to the environment.Mr Burnham has said he is 'open' to new drilling. In his letter, the King reminded Mr Trump of 'our shared responsibility to protect the natural world'Finishing his message, King Charles told Mr Trump: 'The connection between our peoples is one that I trust will only grow stronger with time.'As you mark this momentous occasion, my wife and I send our warmest good wishes to you and to the people of the United States of America, today and in the years ahead.'He signed the letter: 'Charles R.' The Royal Family also posted on X to congratulate the US on its anniversary, attaching a video featuring highlights from the King and Queen's State Visit, including the couple waving from the White House balcony with Mr and Mrs Trump.Signed in Philadelphia in 1776, the Declaration of Independence marked the formal break between the US and Britain.Its anniversary is celebrated annually on July 4, or Independence Day.