Mr Trump contradicted United States investigators - who believe Russian hackers interfered in the 2016 presidential election - and said there was no reason for Moscow to meddle in the vote. The US doesn't have an extradition treaty with Moscow and can't force the Russians to hand over citizens.
Sen. Susan Collins, R-Maine, said the Russians "were relentless in their efforts to meddle in the 2016 elections, and their efforts are ongoing".
Senate Democratic leader Chuck Schumer said Mr Trump's actions had "strengthened our adversaries while weakening our defences and those of our allies".
"We both spoke with Bibi (Israeli Prime Minister Benjamin Netanyahu) and they would like to do certain things with Syria having to do with the safety of Israel", Trump told a joint news conference.
Mr Trump cowardly dodged the question without denouncing Russian Federation, or even hinting that there was any misconduct.
Lisa Murkowski says Trump "ultimately validated Putin at the expense of American intelligence by giving credence to Putin's claim to have not interfered in our elections".
"We were not able to clear all the backlog, but I think we made a first important step in this direction", he said.
Trump responded, "I have great confidence in my intelligence people, but I will tell you that President Putin was extremely strong and powerful in his denial today".
Director of National Intelligence Dan Coats, a Republican and a Trump appointee, responded to Trump's remarks and stood by the U.S. agencies.
The summit, which is being closely watched around the world, was condemned in advance by members of Congress from both parties after the USA indictment last week of 12 Russian military intelligence officers accused of hacking Democrats in the 2016 election to help Mr Trump's presidential campaign.
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.
Other high-profile Republicans also expressed dismay.
Arizona Republican senator Jeff Flake, a frequent critic of Trump, said: "I never thought I would see the day when our American President would stand on the stage with the Russian President and place blame on the United States for Russian aggression".
Netflix plunges as subscriber growth disappoints The company also said it expects 5 million subscribers in the third-quarter, lower than Wall Street's expectations for 6 million. Shares of Netflix, which have more than doubled since the start of the year, dropped by around 14 percent in after-hours trading.
When an Associated Press reporter asked Putin whether he had compromising material on Trump or Trump's family, there were titters and nervous chuckles in the room.
Republican Paul Ryan, Speaker of the House of Representatives, said: "The President must appreciate that Russian Federation is not our ally". He says measures must be taken to prevent future meddling and to hold Russian Federation accountable.
"We have not been getting along well for the last number of years, " Mr Trump said as he and Putin sat down at the Presidential Palace in Finland's capital.
Donald Trump's "America First" slogan morphed into "Me First" as the president unloaded on his own intelligence community and Justice Department to portray himself as the victim of a conspiracy to deny him legitimacy.
"(Mr Putin) said there was no collusion whatsoever. It gave no further details.
A post-summit news conference in Helsinki with Trump and Putin was "everything the Kremlin realistically could have hoped for", said Mark Galeotti, a Russian Federation scholar at the Institute of International Relations Prague. We are accusing President Trump of all kinds of things that I do not believe he's guilty of.
The vehicle, called Kortezh - the Russian word for "motorcade" - rivals the USA president's "Beast" limo in its imposing aura.
Putin said that he was not even aware that Trump was in Moscow in 2013 for the Miss Universe pageant when it has been previously reported that Trump invited him to attend.
"Yes I do. I hold both countries responsible".
During the conference, Putin reiterated his denial of alleged Russian meddling in the 2016 United States presidential elections.
The Russian leader said Russia and the U.S. should discuss a possible extension of the 2010 New START nuclear arms reduction treaty and the implementation of the 1987 Intermediate Nuclear Forces Treaty. Standing alongside Trump in Helsinki, Putin said he had evidence that $400 million dollars in unlawfully acquired cash may have been funneled to the election campaign of Trump's defeated opponent Hillary Clinton.
When she woke up about an hour later, she found the baby was pale with bloody mucous coming from his nose, the affidavit said. Another child in the house, aged two, is now in the care of his father and a preliminary hearing will take place on July 23.
As any Uber rider knows, finding your driver can sometimes be a hassle, especially if you're getting picked up from a busy place. Uber didn't specify when the new features would be available, but an update is now rolling out in the Play Store.
Talking about her birthday plans, Katrina Kaif said that she wants to spend the special time with her loved ones. Katrina, who is reportedly playing an actor in the film, is a striking face in the crowd in the Zero still.
Showers and thunderstorms arrived in the area overnight , signaling the start of a stretch of stormy, steamy days. It will be another hot one today with highs soaring into the mid 90s under a hazy blue sky.
With three games left before the All-Star break, Freeman has a.313 batting average with 16 home runs and a team-high 60 RBIs. Judge, the Yankees slugger and defending home run derby champion, said "I want to stay healthy" in turning down a spot.
Josh Hart comes up with a steal and banks in a tough layup, and LeBron James claps to show his appreciation. James was in Las Vegas this past weekend watching the Los Angeles Lakers Summer League team.
CORRECTIONS: A previous version of this post misidentified the title of Baron Cohen's new Showtime series and the name of Rep. He said as he read it, he thought, "Well, this is kind of insane , but it is Israel and Israel is strong on defense".
Stephen Colbert Wants To Know What Putin Has On Trump
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Critically Endangered Black Rhinos Die in Kenya
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Trump in the UK: What now for the 'special relationship'?
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Amazon Prime Day starts with technical glitches
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Man kicked out of Trump-Putin news conference
Bush and Central Intelligence Agency director under former president Barack Obama, said it amounted to an impeachable act. Trump also attacked special counsel Robert Mueller's investigation, calling it "a disaster for our country".