Is this history’s most important feud? Donald Trump and Elon Musk’s bromance has come to a crashing halt. Their bust-up could have consequences for America and the world.
Richest billionaire v most powerful man
Punch up: Trump complained this weekend that Musk had been "very disrespectful", and announced that the relationship would not be mended. Glossary
US Congress - The United States Congress is the organisation that makes laws in the United States.
X - A social media network, formerly known as Twitter and owned by Elon Musk.
Subsidies - Money given by the state or another body to help keep prices low.
Impeachment - In the United States, as in the UK and many other countries, elected representatives have the power to call for officials to be removed from office for committing a public offence. This is called 'impeachment'.
White House - The official residence of the US president, in Washington DC. Burnt by British troops in 1814, it was rebuilt and painted white to hide the smoke stains.
Clout - Influence or power.
Roman Empire - Lasting from 27BC to 476AD, the Roman Empire controlled regions around the Mediterranean in Europe, North Africa and Western Asia.
Julius Caesar - A Roman general, politician, and dictator (100–44 BCE) who played a key role in the fall of the Roman Republic and the rise of the Roman Empire. He was stabbed to death by a group of Roman senators.
Barons - Members of the lowest order of British nobility.
Magna Carta - A charter signed by a group of noblemen and King John in 1215 which imposed limits on the powers of the king.