'I will be announcing my decision on the Paris Accord over the next few days. Make America great again!' Trump said.
The year 2016 was officially the Earth's warmest since record-keeping began in the 1880s, the World Meteorological Organization announced on Wednesday.
Nick Ayers, the 36-year-old chief of staff to the vice-president Mike Pence, is Kelly's likely successor.
Defiant employees from multiple US government agencies are fighting the Trump administration's gag orders on climate change and penchant for "alt facts" with rogue Twitter accounts.
Incoming US President Donald Trump has assembled a core team that is -- not surprisingly -- overwhelmingly white and male.