BBC- 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 Reuters 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.
The independent Arms Control Association non-profit group criticized Mr Trump's remarks.
"Mr Trump's comments suggest, once again, that he is ill-informed about nuclear weapons and has a poor understanding of the unique dangers of nuclear weapons," the group said in a statement.
"The history of the Cold War shows us that no one comes out on 'top of the pack' of an arms race and nuclear brinksmanship."