A former US official who claims to have seen a draft of the plans said that the Pentagon is spearheading the initiative ordered by the White House.
The aim of the new policy is to deter Russia from using tactical warheads in a possible conflict with Eastern Europe.
'What I've been told by the people who wrote the thing was what they were trying to do was to send a clear deterrent message to Russians, the North Korean and the Chinese,' Wolfsthal said.
Wolfsthal also noted that plans are in motion to apply lower-yield 'tactical' nuclear ballistic missiles to the military's new Columbia-class submarines.
Security experts, however, have voiced concern with the policy, arguing that constructing more 'usable' nuclear weapons increases the likelihood of their use.
The ex-Obama adviser called the strategy 'pretty dumb,' pointing out that launching an attack with a significantly smaller nuclear pay-load would impose neglect able damage.
According to the experts, Trump administration will 'increase risk of nuclear war' with new plans to develop smaller warheads that are less destructive and a loosening of 'first-use' constraints.
Jon Wolfsthal, who was special assistant to Barack Obama on arms control and nonproliferation claims that the defense department is spearheading the plan that aims to prevent hostile actors from attacking US interests. It is also attempting to loosen constraints that guide first-strike protocols.
The Trump administration is being accused of making nuclear war more likely with plans to introduce lower-yield nuclear weapons with reduced destructive capability that would diminish the psychological bar for using them.