Nuclear security

Trump repeats call for US nuclear supremacy

President Donald Trump has said he wants the United States to expand its nuclear arsenal, in his first comments on the issue since taking office.

Mr Trump said it would be "wonderful" if no nation had nuclear arms, but otherwise the US must be "top of the pack".

He told Reuter that the US had "fallen behind on nuclear weapon capacity".

Critics say the US and Russia already have more weapons than necessary to deter a nuclear attack.

The US has 6,800 nuclear weapons and Russia has 7,000, according to the US nonpartisan Arms Control Association.