Senator Chris Murphy said talks between Donald Trump and North Korea were on “life support” and he was not “incentivising” Kim Jong-un.
Speaking on MSNBC, Mr Murphy said President Trump was “not wrong” to state to the North Koreans there was a military option.
But he said Mr Trump was “undercutting” his Secretary of State and US diplomats.
Mr Murphy, a Democrat, said: “It’s not surprising that our negotiations are on life support right now, President Trump is deploying what is perhaps the worst negotiating strategy in the history of the American presidency.
“It’s not just that he’s out there calling this guy names, it’s that he is publicly undercutting his department of state by tweeting out that Rex Tillerson does not have his support and cannot talk and negotiate on his behalf.
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“You’ve got to empower your diplomats and Trump is not wrong to make it very clear to the North Koreans that we have a military option, that we can take them out if they were to ever attack or threaten to attack us or our allies.
“But you’ve actually got to empower your diplomats to do the work and you’ve got to communicate that the previous nuclear deals, that other presidents have signed, are still good, by threatening to back out of the Iran nuclear agreement.
“You’re not incentivising the North Koreans to enter into their own agreement.
“So it’s a combination of military threats, real bilateral, multilateral economic sanctions, which this president cannot put together because he is out there insulting all of the allies who would work with us on sanctions and empowering your diplomats, he is doing none of the things necessary to achieve a real diplomatic breakthrough on North Korea.”
North Korea has threatened the Unites States by blasting that the country is at the “door of doom”
The Hermit state talked tough in its latest statement released by state-run newspaper Minju.
A spokesman said: “Although the South Korean puppet authorities try to frighten the DPRK by resorting to more frantic anti-DPRK pressure campaign with the backing of the US, the army and the people of the DPRK will never be afraid of it.
“They would be well advised to behave themselves, clearly mindful that they cannot escape the most miserable end together with the US, which is at the door of doom.”
North Korea’s threat comes as the US ramps up its military presence in the Korean peninsula.
Mr Trump upset Kim after he sent two warships to the region this week in a direct show of force to the leader.