Sanders rips Trump as 'Tweeter in Chief' for nuke talk
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Vermont Senator Bernie SandersBernie SandersHickenlooper day-old Senate bid faces pushback from progressives Steyer calls on DNC to expand polling criteria for debates Andrew Yang: News coverage of Trump a 'microcosm' of issues facing country MORE (I) dubbed President-elect Donald TrumpDonald John TrumpDavid Axelrod after Ginsburg cancer treatment: Supreme Court vacancy could 'tear this country apart' EU says it will 'respond in kind' if US slaps tariffs on France Ginsburg again leaves Supreme Court with an uncertain future MORE the "Tweeter in Chief" Friday afternoon for potentially sparking an arms race through Twitter.

Sanders's criticism comes a day after Trump tweeted that the United States should "greatly strengthen and expand its nuclear capability," and just hours after Trump reportedly told MSNBC's Mika Brzezinski "let it be an arms race" in an off-air phone call.

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"Congress must not allow the Tweeter in Chief to unleash a dangerous and costly nuclear arms race," Sanders wrote Friday in his response to Trump.

Trump's tweet was followed by a statement from spokesman Jason Miller, who said that Trump “was referring to the threat of nuclear proliferation and the critical need to prevent it—particularly to and among terrorist organizations and unstable and rogue regimes."

“He has also emphasized the need to improve and modernize our deterrent capability as a vital way to pursue peace through strength,” Miller said.

On Thursday, both Trump and Russian officials expressed a desire for more nuclear weapons.

The statements have sparked backlash from politicians and political observers who say the countries are reigniting an arms race reminiscent of the Cold War stand-off between the U.S. and the Soviet Union.