US President Donald Trump’s announcement to resume nuclear weapons testing has sharply divided lawmakers. The move, described as a warning to Russia, has ignited a fierce debate in Washington over national security, global stability, and America’s foreign policy stance.

Democrats condemned the decision, calling it dangerous and shortsighted, while Republicans defended it as a firm response to Russian aggression and President Vladimir Putin’s nuclear threats.

Democrats Warn of Global Fallout

Democratic Senator Mark Kelly, who serves on the Senate Armed Services subcommittee overseeing America’s nuclear arsenal, said the plan would backfire. “It would be a mistake for us to do this because we have nothing, we have very little to gain,” he said.

Kelly warned that restarting tests could encourage other powers to follow suit. “If we did a test and then China decided, OK, I’m going to start testing. They’ll start testing their nuclear weapons, then their strategic forces capability gets much better. We have zero to gain. This would be a gift to China,” he added.

Senator Elizabeth Warren also voiced concern, questioning the financial and ethical implications of the plan. She criticized Republicans for supporting the testing despite the Trump administration’s push for budget cuts. “The Department of Defence has a long history of understating costs and claiming shorter timelines for these giant nuclear programs,” Warren said.

She added, “As soon as Congress signs on the dotted line, the costs start going up, and the time to completion stalls, rolling further and further out … Republicans should be just as outraged as Democrats over the DOD’s lack of honesty about how this program is operating.”

Some Democrats also pointed out the timing of Trump’s decision, noting that it came while the US government was under a shutdown, adding further pressure on federal agencies.

Republicans Rally Behind Trump

In contrast, Republicans have largely supported Trump’s move, describing it as a strong and necessary message to US adversaries. The president made the announcement on Truth Social during his visit to South Korea, just hours before meeting Chinese President Xi Jinping.

Not long after Trump’s post, Russian President Vladimir Putin claimed that Moscow had successfully tested new nuclear-capable missiles. Despite this, Sen. James Risch, chair of the Senate Foreign Relations Committee, said Trump’s decision was not provocative. “This is not escalatory,” Risch said, calling Putin a “madman” who was testing Trump’s resolve. “Nobody believes he’s [Putin] going to use nuclear weapons … having said that, he’s been doing this all along, trying to intimidate Trump. I think Trump was saying, I’m not intimidated about it.”

GOP Leaders Call It a Message of Strength

House Speaker Mike Johnson also backed the president’s directive to the Pentagon. He said the plan sends a “strong message” that America is ready to defend itself. “The commander in chief wants us to be fully prepared. We are the last great superpower on Earth. China intends to be a near peer-to-peer advisory to us,” Johnson said.

He added, “But in order to maintain peace around the world, you have to show strength, and that’s what the president believes in. That’s what he’s demonstrated over and over.”

Senator Lindsey Graham, a strong Trump ally, described the nuclear testing order as a “response” to Putin’s behavior amid the ongoing war in Ukraine. “I think Putin’s misjudging Trump,” Graham said. “You threaten our country. You will regret it.”

However, not all Republicans were fully on board. Senator Ron Johnson of Wisconsin said he wanted to review the details before taking a position. “I’ll have to see what Trump means regarding testing nuclear weapons,” he said, though he emphasized the need to keep America’s “nuclear forces modernised for sure.”

A Divided Capitol and Uncertain Future

Trump’s nuclear testing plan has reignited a Cold War-style divide in Washington. Supporters see it as a show of strength against adversaries like Russia and China, while critics fear it could destabilize global security and restart an arms race.

As the debate continues, one thing is clear — the president’s decision has left the nation’s leaders deeply split on how far the US should go to prove its power.