Washington DC - President Donald Trump responded Sunday to criticism over his increasing closeness to Russia on Ukraine, saying the US should worry "less" about Vladimir Putin.

"We should spend less time worrying about Putin, and more time worrying about migrant rape gangs, drug lords, murderers, and people from mental institutions entering our Country – So that we don't end up like Europe!" Trump posted to his Truth Social platform Sunday night.

Trump's stark shift in approach to the war and Russia was on full display days earlier when he berated Ukraine President Volodymyr Zelensky in front of reporters at the White House.

The unprecedented public spat – with Trump calling the Ukrainian leader "disrespectful" – resulted in Zelensky leaving the White House without the anticipated signing of a pact on sharing mineral rights.

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Trump's growing closeness with Putin has rung alarm bells across Europe as well as among Democratic Party lawmakers, who have raised national security concerns.

"The White House has become an arm of the Kremlin," said Democratic Senator Chris Murphy, who has emerged as one of Trump's most outspoken critics.

"It appears America is trying to align itself with dictators," he earlier told CNN.

Trump's Republican party, meanwhile, has largely fallen in line behind him, with top officials suggesting Zelensky steps down to ensure a peace deal with Moscow.

"We need a leader that can deal with us, eventually deal with the Russians, and end this war," National Security Advisor Mike Waltz told CNN on Sunday.