Trump's tweet calling to strengthen US nuclear programme comes after similar remarks were made by Russian President Vladimir Putin.
US President-elect Donald Trump has tweeted that the United States should look to greatly strengthen and expand its nuclear capability.
The United States must greatly strengthen and expand its nuclear capability until such time as the world comes to its senses regarding nukes— Donald J. Trump (@realDonaldTrump) December 22, 2016
Trump made the statement on Twitter, without providing details or context, a day after meeting a group of Pentagon top brass, and shortly after Putin called for Russia to reinforce its own nuclear capabilities.
Trump's spokesperson later clarified the tweet.
"President-elect Trump was referring to the threat of nuclear proliferation and the critical need to prevent it - particularly to and among terrorist organisations and unstable and rogue regimes," spokesperson Jason Miller said.
TRT World's Jenniffer Glasse in Washington has more.