Sri Lanka, Jan. 20 -- US President Donald Trump on Tuesday criticised the UK's deal to hand sovereignty of the Chagos Islands to Mauritius, calling it an "act of great stupidity" and "total weakness."

Trump said that relinquishing the remote Indian Ocean archipelago - home to a key joint US-UK military base on Diego Garcia, the largest island - was "another in a very long line of national security reasons why Greenland has to be acquired."

"Shockingly, our 'brilliant' NATO ally, the United Kingdom, is currently planning to give away the island of Diego Garcia, the site of a vital US military base, to Mauritius, and to do so for no reason whatsoever," he said in a post on his social media platform Truth Social.

"There is no doubt that Chi...