GOP Sen. Jeff FlakeJeffrey (Jeff) Lane FlakeCheney clashes with Trump Sessions-Tuberville Senate runoff heats up in Alabama GOP lawmakers stick to Trump amid new criticism MORE (Ariz.) blasted President TrumpDonald John TrumpKimberly Guilfoyle reports being asymptomatic and 'feeling really pretty good' after COVID-19 diagnosis Biden says he will rejoin WHO on his first day in office Lincoln Project offers list of GOP senators who 'protect' Trump in new ad MORE minutes after a joint press conference with Russian President Vladimir Putin, calling his rhetoric "shameful."

Trump, during a closely watched press conference with Putin, took a swipe at special counsel Robert MuellerRobert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE's probe and said both the United States and Russia were to blame for the current soured state of relations between them.

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"I hold both countries responsible. I think that the United States has been foolish. I think we've all been foolish. ... I think we're all to blame," he told a reporter at the press conference in Helsinki when asked if he held Russia accountable.

Trump also called Mueller's probe a "disaster" and downplayed Russia's meddling in the 2016 election.

Flake is one of several GOP lawmakers who immediately criticized Trump's comments during the press conference.

GOP Sen. Ben SasseBenjamin (Ben) Eric SasseChamber of Commerce endorses Cornyn for reelection Trump administration narrows suspects in Russia bounties leak investigation: report Russian bounties revive Trump-GOP foreign policy divide MORE (Neb.) called them "bizarre and flat-out wrong."

While GOP Sen. Lindsey GrahamLindsey Olin GrahamLincoln Project offers list of GOP senators who 'protect' Trump in new ad The Hill's Morning Report - Presented by Facebook - Trump backs another T stimulus, urges governors to reopen schools Democrats awash with cash in battle for Senate MORE (S.C.) warned that Trump's rhetoric on election interference could paint the United States as weak and that the summit was a "missed opportunity."

"Missed opportunity by President Trump to firmly hold Russia accountable for 2016 meddling and deliver a strong warning regarding future elections. This answer by President Trump will be seen by Russia as a sign of weakness and create far more problems than it solves," he said in a tweet.

Neither Speaker Paul RyanPaul Davis RyanBush, Romney won't support Trump reelection: NYT Twitter joins Democrats to boost mail-in voting — here's why Lobbying world MORE (R-Wis.) nor Senate Majority Leader Mitch McConnellAddison (Mitch) Mitchell McConnellLincoln Project offers list of GOP senators who 'protect' Trump in new ad State and local officials beg Congress to send more election funds ahead of November Teacher's union puts million behind ad demanding funding for schools preparing to reopen MORE (R-Ky.) immediately commented.