"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", Trump said. He added: "There are quite a few of them for us to pay attention to".
On Monday, the former CIA chief was expressing his fury that the president declined to back the US intelligence community's assessment that Russian Federation interfered in the 2016 presidential election.
Many fear that Trump - in his eagerness to prove he was right to seek the summit despite USA political opposition - may give up too much ground.
"Our relationship with Russian Federation has NEVER been worse", Trump tweeted Monday morning, blaming "many years of US foolishness and stupidity and now, the Rigged Witch Hunt!".
Trump faced severe criticism from Democrat and Republican lawmakers for meeting with Putin, who has been accused of taking an aggressive stance towards the US. But Trump did not strongly condemn the interference efforts, which US intelligence agencies insist did occur, including hacking of Democratic emails, the subject of last week's indictment of 12 Russians.
"The president met with Putin after sparring for the better part of the past week with traditional US allies - first with North Atlantic Treaty Organisation nations over their levels of defense spending, and later with British Prime Minister Theresa May over her "Brexit" strategy, though he seemed to patch things up before leaving London", writes Fox.
"I get the feeling, I've seen it first-hand actually, sometimes the president cares more about how a leader treats him personally than forcefully getting out there and pushing against things that we know have harmed our nation", Corker said. He called Russian Federation a "foe in certain respects". He says he ran a "brilliant campaign and that's why I'm president".
"We were not able to clear all the backlog, but I think we made a first important step in this direction", he said. I think the USA has been foolish.
EPA NEW ERA Putin declared the Cold War over and called for'trust
"I don't see any reason why it would be" Russia, Trump said.
The US and Russian Federation control most of the world's nuclear weapons.
"I will say this, I don't see any reason why it would be", Trump said Monday, when asked whether he believed US intelligence officials over Putin and whether he would denounce the Russian interference.
But U.S. lawmakers of both parties said following Friday's indictments, which resulted from Mueller's probe, that Trump must either confront Putin in Helsinki or cancel the meeting in protest. When President Trump visited Moscow back then, I didn't even know he was in Moscow.
The Russian Foreign Minister Sergei Lavrov said separately that the talks were "better than super" in comments reported by Russian news agencies. "It will be determined by the heads of state themselves as they go along". Trump seemed to return the favor by waiting until Putin had arrived at the palace before leaving his hotel.
In June op-ed he wrote for The Washington Post, Brennan called Trump a "snake-oil salesman" who has shown 'mean-spirited, malicious, and highly abnormal behavior'.
Officials at the Kremlin and the White House say Putin and Trump will discuss numerous issues causing the most friction between the countries. Other issues expected to come up include Russian election meddling, Crimea, and Syria.
Putin said he is glad to meet his USA counterpart and wants to discuss with him relations between the two countries and global problems.
One possible outcome of the summit is renegotiation of a nuclear treaty that expires in 2021.
Meanwhile, US lawmakers and political observers on both sides are warning Trump not to trust Putin.