Sanders rips Trump as 'Tweeter in Chief' for nuke talk
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Vermont Senator Bernie SandersBernie SandersSchumer vows next steps after 'ridiculous,' 'awful' GOP election bill filibuster Schumer, Pelosi meeting with White House on infrastructure Feehery: 8 reasons why Biden should take the bipartisan infrastructure deal MORE (I) dubbed President-elect Donald TrumpDonald TrumpGuardian Angels founder Curtis Sliwa wins GOP primary in NYC mayor's race Garland dismisses broad review of politicization of DOJ under Trump Schumer vows next steps after 'ridiculous,' 'awful' GOP election bill filibuster 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.