Why has Trump warned UK not to 'give away' the tiny island of Diego Garcia to Mauritius?

US President Donald Trump is publicly cautioning the United Kingdom against proceeding with a sovereignty transfer of the Chagos Islands to Mauritius while retaining the strategic military base under a long-term lease.
The controversy is rooted in a 2025 …
Why has Trump warned UK not to ‘give away’ the tiny island of Diego Garcia to Mauritius?