He then went on to say that Moscow expected that the summit of the two leaders would lay the ground for the normalization of bilateral relations.
The charges put an even greater spotlight on Trump's treatment of Putin, who has denied making efforts to intervene in the USA election that Trump, a Republican, unexpectedly won. He may deny it, ' Trump said.
His comments came one day after a USA grand jury indicted 12 officers of the Main Intelligence Directorate, or GRU, of the Russian General Staff.
The Russians are charged with stealing usernames and passwords of people working in Democrat Hillary Clinton's presidential campaign and hacking into the computer networks of other Democratic Party organisations.
But it's Trump's version of reality on another topic that may come to define his meeting with Putin.
But the President's tour-de-grace came during his suddenly announced solo news conference at the end of the North Atlantic Treaty Organisation summit that sent reporters scrambling to make it into the room on time and wondering whether Trump would announce the USA was leaving North Atlantic Treaty Organisation after reports suggested he had threatened to do so earlier in the day.
"There's no allegation that the conspiracy changed the vote count or affected any election result", Deputy Attorney General Rod Rosenstein said in announcing the charges at a press conference in Washington.
Trump has long downplayed Russia's meddling in the 2016 election and has repeatedly referred to Mueller's investigation as a "witch hunt" even as it has piled up guilty pleas and indictments of Russians and Trump campaign associates. But he predicted Putin wouldn't confess.
"So I have North Atlantic Treaty Organisation, I have the United Kingdom - which is somewhat in turmoil", Trump said.
"I know you'll ask will we be talking about meddling and I will absolutely bring that up".
Republican Senator Jeff Flake of Arizona, a frequent critic of the president, said Trump must do more than ask.
Scuffles broke out at one point as attendees - who chanted slogans including "We love you Donald" - passed a nearby anti-fascism protest.
Gowdy, the chairman of the House Oversight and Government Reform Committee said in a statement that "Russia attempted to sow the seeds of discord, undermine the fundamentals of our democracy and challenge the reliability of the 2016 election".
Asked if he could accept Russia's annexation with Crimea and still get along with Putin, he said, 'When it comes to Crimea, there's nothing much I have to say about it other than we will look at that just like I'm looking at many disasters that I've taken over'.
Trump cautioned that it was hard to do substantive deals with Russia because his opponents would say that he was too pro-Russian.
Nancy Pelosi, the top Democrat in the House, stressed that Russians should be treated more sever due to the current conditions.
Trump, a 72-year-old former NY real estate developer who praises his own dealmaking skills, and Putin, a 65-year-old former KGB spy who cultivates a macho image as a Russian man of action, are due to have some time alone at the summit.
"I will absolutely, firmly ask the question, and hopefully we'll have a good relationship with Russian Federation", he told a joint press conference with British Prime Minister Theresa May.
The summit is set for July 16 in Helsinki, and plans for their meeting do not appear to be slowing down despite the new revelations.