Tensions have been brewing since the U.S Intelligence Community declared Russian Federation tried to meddle with the results of the 2016 USA elections.
Trump said that while US officials have shown him that Russian Federation interfered with election systems, Putin has said "it's not Russia" who meddled.
Putin, meanwhile, when asked directly, didn't deny having compromising material on Trump or his family.
At a time when the world really needed Mr Trump, as the leader of the free world, to stand up to his controversial counterpart, he couldn't say one critical word about Russian Federation on any of the issues that have brought relations between Washington and Moscow to a post-Cold War low.
"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", tweeted Senator Jeff Flake.
Mr Trump told the press conference that the United States and Russian Federation must find ways to "co-operate in pursuit of shared interests".
Earlier Monday, House Minority Leader Nancy Pelosi (D-Calif.) said that Trump's performance in Helsinki "proves that the Russians have something on the president, personally, financially, or politically".
Liina Isto deputy chair of Finns Party Youth Wing. Image Yle Zena Iovino
He blamed part of the bad relationships not on Putin's invasion of Crimea, his interference in Ukraine, his downing of a civilian Malaysian airliner over Ukraine, his multiple poisoning attacks in the United Kingdom, his gross human rights record, or his abuses of the press and crackdowns on political dissident...but on the Mueller investigation. However, that changed as of about four hours ago. Putin said. "This is utterly ridiculous".
"This is the first high-end luxury auto manufactured domestically in many years", says a Russian state media webpage about the Kortezh, in a nod to the old Cold War days in which Soviet-made Zil limousines ferried communist leaders around.
Mr Putin feels strongly about the issue, Mr Trump claimed, and "has an interesting idea".
Huntsman hasn't commented since the summit, which comes just days after the Justice Department indicted 12 Russian intelligence officers for hacking the Democratic National Committee during the 2016 election. "Seriously, what does Putin have on Trump that's he's so afraid?" "We've all been foolish", he said, before veering into discussion about his election victory.
"We'll be talking about other parts of the Middle East".
Israeli prime minister Benjamin Netanyahu has appealed to both Mr Trump and Mr Putin to eliminate the Iranian presence, which the Jewish state regards as an existential threat. "We have 90 percent of the nuclear and that's not a good thing, it's a bad thing".
Another senior Republican, Sen Lindsey Graham, also a member of the Senate Armed Services Committee, tweeted that it was a "missed opportunity.to firmly hold Russian Federation accountable for 2016 meddling".
The U.S. government also sought Russian government help through a mutual legal assistance treaty, but according to a court filing this month, "no further steps have been taken within Russia to effectuate service". The vehicle that then whizzed Mr Putin through Helsinki's blocked-off streets also symbolised the rising global prestige that Mr Putin has cast himself as bestowing upon Russian Federation. Mr Trump had previously criticised the pipeline.
Just minutes before the press conference, a man holding a sign had a scuffle with security personnel and was escorted out of the room.