Democratic Senator Chris Murphy was blunter: "This entire trip has just been one giant middle finger from President Trump to his own country". Trump said in a tweet aboard Air Force One on his way back home.
Rush Limbaugh said watching the USA media cover Monday's Trump-Putin summit was "comedy gold", but added the downside of its ineptitude is so-called journalists can "wreak tremendous havoc". Trump failed to press Putin on one single point of policy, rattled off some right-wing conspiracy theories, and most disturbingly, declared that he believes the word of a former KGB agent over every US intelligence agency regarding Russia's interference in our elections.
Making efforts to move past the politically-charged allegations, Putin touted the summit as a "success".
Mitt Romney, the 2012 Republican candidate for president, called Trump's behavior "disgraceful and detrimental to our democratic principles" and said it "undermines our national integrity and impairs our global credibility". "The damage inflicted by President Trump's naivete, egotism, false equivalence, and sympathy for autocrats is hard to calculate".
"The President's statements today in Helsinki demonstrate his continued refusal to accept the unanimous conclusions of US intelligence leaders and the bipartisan findings of the Senate Intelligence Committee", Collin said.
And when Putin called Trump "Donald" - a sign of disrespect that Trump's foes usually use - the president should have responded in kind, calling Putin "Vlad". "I have covered this president since the moment he was sworn in and have never been at a press conference like this one".
Former Speaker of the House Newt Gingrich tweeted that this was the "most serious mistake of his presidency".
His scepticism drew a quick formal statement - nearly a rebuttal - from Mr Trump's director of national intelligence, Dan Coats.
"Donald Trump's press conference performance in Helsinki rises to & exceeds the threshold of "high crimes & misdemeanors". "It was nothing short of treasonous".
He said: "Not only were Trump's comments imbecilic, he is wholly in the pocket of Putin".
The former Central Intelligence Agency director tweeted: "Why did Trump meet 1 on 1 with Putin?"
Mr Trump addressed the fact that he thinks the countries "have not been getting along very well for the last number of years" but that "I really think the world wants to see us get along".
A person was removed from a briefing room for the press conference between President Trump and Russian President Vladimir Putin in Helsinki just before it was set to begin on Monday.
The Democratic Party, the corporate media and leading figures within the U.S. military and intelligence apparatus have joined in branding Trump a traitor who is functioning as an agent of the Kremlin.
The news conference also rattled some officials in the State and Defense Departments and in USA intelligence agencies, according to officials in five government offices.
"All I can speculate is that there was an effort underway to sort of figure out if by being nice to Vladimir Putin there is a way that we can establish a better working relationship, which in a ideal world would not be a bad thing between two nations that possess 90 percent of the world's nuclear weapons", Rubio said.
Such is the choice offered by the American ruling class to the population of the United States: Side with Trump or side with the unaccountable and murderous operatives of the "deep state".
The new Russian-made limousine carrying Russian president Vladimir Putin drives prior to an inauguration ceremony at the Kremlin in Moscow on May 7, 2018.
It's for that reason that since the 2016 campaign Trump has forcefully rejected any suggestion of Russian support for his candidacy. "Openly", wrote the Washington Post's editorial board.
On March 18, President Vladimir Putin signed the treaty on Crimea's reunification with Russian Federation and the Federal Assembly (parliament) approved the document on March 21.
He said his message was "best delivered in person", adding that he "spent a great deal of time" talking about election meddling.