Sen. Bernie Sanders Bernie SandersNYT editorial board remembers Ginsburg: She 'will forever have two legacies' Two GOP governors urge Republicans to hold off on Supreme Court nominee Sanders knocks McConnell: He's going against Ginsburg's 'dying wishes' MORE (I-Vt.) on Wednesday went after President Trump for his intensifying rhetoric on North Korea.

"Trump’s bombastic rhetoric is not appropriate when we are dealing with the possibility of a nuclear war that could kill millions of people," Sanders tweeted Wednesday.

"We need serious people at the @StateDept dealing with the issue of North Korea’s development of nuclear weapons & missile capability."

The Vermont senator said the country needs to work with China and its allies around the world to develop a "comprehensive diplomatic strategy to address the problem."

Trump’s bombastic rhetoric is not appropriate when we are dealing with the possibility of a nuclear war that could kill millions of people. https://t.co/arcCSVuxR3 — Bernie Sanders (@SenSanders) August 9, 2017

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His comments come after Trump on Tuesday issued a provocative warning to North Korea.

"He has been very threatening beyond a normal state, and as I said they will be met with fire, fury and frankly power, the likes of which this world has never seen before,” Trump said Tuesday.

On Wednesday, Trump ratcheted up his rhetoric, pointing to the strength of the U.S. nuclear arsenal.

He said he hoped the "power" of the U.S. nuclear arsenal would never have to be used, adding "there will never be a time that we are not the most powerful nation in the world."