Democratic senators on Monday ripped President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE for his remarks during a joint press conference with Russian President Vladimir Putin, in which he refused to condemn Russian meddling in the 2016 election.

"That was disturbing," Sen. Bob Menendez Robert (Bob) MenendezKasie Hunt to host lead-in show for MSNBC's 'Morning Joe' Senators ask for removal of tariffs on EU food, wine, spirits: report VOA visa decision could hobble Venezuela coverage MORE (D-N.J.) tweeted after the Helsinki press conference. "Shameful. Jaw-dropping. Disgraceful. I am running out of words to describe how despicable it is to see an American President capitulate to a dictator."

That was disturbing. Shameful. Jaw-dropping. Disgraceful. I am running out of words to describe how despicable it is to see an American President capitulate to a dictator. #Helsinki — Senator Bob Menendez (@SenatorMenendez) July 16, 2018

Trump on Monday said he doesn't "see any reason why it would be" Russia who hacked Democratic servers in 2016.

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He also blamed special counsel Robert Mueller Robert (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 investigation into Russian election meddling for keeping the U.S. and the Kremlin "separated," adding that there "was no collusion at all."

Democrats have slammed Trump for his behavior at last week's NATO summit in Brussels, where he publicly criticized member nations for what he considered insufficient defense spending, and for his criticisms of British Prime Minister Theresa May when he visited England.

GOP lawmakers also criticized Trump's refusal to blame Russia for interfering in the 2016 presidential election, but Democrats held nothing back as they called Trump treasonous, shameful and a disgrace.

Sen. Bill Nelson Clarence (Bill) William NelsonDemocrats sound alarm on possible election chaos Trump, facing trouble in Florida, goes all in NASA names DC headquarters after agency's first Black female engineer Mary W. Jackson MORE (D-Fla.) said the president's behavior should "alarm us all."

"Putin is a threat to our democracy and our upcoming election, that's a fact," Nelson tweeted. "The president's unwillingness to stand up to him and defend our nation is unacceptable and embarrassing."

Sen. Mark Warner Mark Robert WarnerDemocrats call for declassifying election threats after briefing by Trump officials It's time to upgrade benefits Intelligence chief says Congress will get some in-person election security briefings MORE (D-Va.) called the press conference a "complete disgrace," while Sen. Chris Van Hollen Christopher (Chris) Van HollenCongress must finish work on popular conservation bill before time runs out Democrats fear Russia interference could spoil bid to retake Senate Mid-Atlantic states sue EPA over Chesapeake Bay pollution MORE (D-Md.) called Trump's repeated denials "insane."

"It’s insane that the President of the United States is attacking the FBI and believes Putin over his own intelligence officials and evidence presented by both the House and the Senate," Van Hollen tweeted.

Sen. Elizabeth Warren Elizabeth WarrenDimon: Wealth tax 'almost impossible to do' CNN's Don Lemon: 'Blow up the entire system' remark taken out of context Democrats shoot down talk of expanding Supreme Court MORE (D-Mass.), who is considered a 2020 presidential contender, tweeted that Trump took "to the international stage to embarrass America, undermine our institutions, weaken our alliances, & embrace a dictator."

Sen. Edward Markey Edward (Ed) John MarkeyDemocrats shoot down talk of expanding Supreme Court Schumer: 'Nothing is off the table' if GOP moves forward with Ginsburg replacement Democrats see fundraising spike following Ginsburg death MORE (D-Mass.) said in a statement that "America’s relationship with Russia is at its lowest point since the Cold War because Russia is not behaving like a responsible world power."

He said Trump missed the opportunity to publicly condemn Russia for its military aggression in Ukraine and Putin's support for Syrian leader Bashar al-Assad.

Sen. Chris Murphy Christopher (Chris) Scott MurphyDemocratic senator calls for 'more flexible' medical supply chain to counter pandemics The Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon GOP chairman to release interim report on Biden probe 'in about a week' MORE (D-Conn.) said Trump's European trip has been "one giant middle finger from President Trump to his own country."

"Just jraw dropping," Murphy said.