President Trump says 'Nobody really knows' if Russia interfered in 2016 election

President Trump on Thursday said that "nobody really knows" whether Russia hacked the 2016 presidential election -- a statement that comes one day before the U.S. commander in chief is set to meet Vladimir Putin face-to-face at the G20 summit in Hamburg.

During a joint press conference with Polish President Andrzej Duda, Hallie Jackson of NBC News asked the U.S. president whether he would "definitively say that Russia interfered in the 2016 election."

"Well I think it was Russia and I think it could have been other countries," Trump said in response. "I think a lot of people interfere. I think its been happening for a long time. It's been happening for many, many years."

Watch below for Trump's full response on Russia's 2016 election involvement:​​​​​​

The president continued, suggesting there is no definitive answer as to whether Russia was involved in a hack of the 2016 election.

"Mistakes have been made. I agree, I think it was Russia, but I think it was other people and countries, and I see nothing wrong with that statement," Trump said. "Nobody really knows. Nobody really knows for sure."

The FBI, NSA and CIA were all involved in an assessment that produced the intelligence agreement that Russia interfered in the 2016 election. This was confirmed during congressional testimony offered by former Director of National Intelligence James Clapper on May 8.

Trump then pivoted, though, and slammed former President Barack Obama for what he described as intentional inaction on the CIA intelligence that Russia was interfering in the 2016 contest between Democratic candidate Hillary Clinton and then-Republican candidate Donald Trump.

RELATED: Donald Trump and Melania Trump in Poland for G20

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Donald Trump and Melania Trump in Poland for G20
The President of the U.S., Donald Trump and his wife Melania Trump arrives to the Warsaw airport (Photo by Celestino Arce/NurPhoto via Getty Images)
Polish President Andrzej Duda (R) and US President Donald Trump hold a meeting at the Royal Castle in Warsaw, Poland, July 6, 2017. / AFP PHOTO / SAUL LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)
Polish President Andrzej Duda (R) and US President Donald Trump hold a joint press conference at the Royal Castle in Warsaw, Poland, July 6, 2017. / AFP PHOTO / SAUL LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)
First Lady Melania Trump (L) and Agata Kornhauser-Duda (R) meet at the Belvedere Palace in Warsaw on July 6, 2017. US President Donald Trump is on his first visit behind the former Iron Curtain. He is expected to focus largely on defence in talks with Baltic, Balkan and central European leaders. / AFP PHOTO / Andrzej HULIMKA (Photo credit should read ANDRZEJ HULIMKA/AFP/Getty Images)
Polish President Andrzej Duda (R) greets US President Donald Trump prior to meetings at the Royal Castle in Warsaw, Poland, July 6, 2017. / AFP PHOTO / SAUL LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)
First Lady Melania Trump is pictured during a meeting with Polish President's wife Agata Kornhauser-Duda (Unseen) at the Belvedere Palace in Warsaw on July 6, 2017. US President Donald Trump is on his first visit behind the former Iron Curtain. He is expected to focus largely on defence in talks with Baltic, Balkan and central European leaders. / AFP PHOTO / ANDRZEJ HULIMKA (Photo credit should read ANDRZEJ HULIMKA/AFP/Getty Images)
First Lady Melania Trump (R) and Polish President' s wife Agata Kornhauser-Duda (L) meet at the Belvedere Palace in Warsaw on July 6, 2017. US President Donald Trump is on his first visit with his wife behind the former Iron Curtain. He is expected to focus largely on defence in talks with Baltic, Balkan and central European leaders. / AFP PHOTO / ANDRZEJ HULIMKA (Photo credit should read ANDRZEJ HULIMKA/AFP/Getty Images)
US President Donald Trump attends the Three Seas Initiative Summit of Eastern European countries at the Royal Castle in Warsaw, Poland, July 6, 2017. / AFP PHOTO / SAUL LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)
US President Donald Trump arrives for the Three Seas Initiative Summit of Eastern European countries at the Royal Castle in Warsaw, Poland, July 6, 2017. / AFP PHOTO / SAUL LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)
Lithuanian President Dalia Grybauskaite (3ndL), President of the Republic of Estonia Kersti Kaljulaid (4thL), US President Donald Trump (5thL), Polish President Andrzej Duda (C) Croatian President Kolinda Grabar-Kitarovic (5thR), President of Hungary Janos Ader and President of the Solvakei Andrej Kiska (R) pose for photographers alongside other participating nations in the Three Seas Initiative of Eastern European countries during a family photo at the Royal Castle in Warsaw, Poland, July 6, 2017. / AFP PHOTO / SAUL LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)
US President Donald Trump (2ndR) and Croatian President Kolinda Grabar-Kitarovic (2ndL) hold a meeting at the Royal Castle in Warsaw, Poland, on July 6, 2017. / AFP PHOTO / SAUL LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)
First Lady Melania Trump (center L) and Polish President's wife Agata Kornhauser-Duda (Center R) play with children as they visit the Copernicus Science Center in Warsaw on July 6, 2017. US President Donald Trump is on his first visit behind the former Iron Curtain. He is expected to focus largely on defence in talks with Baltic, Balkan and central European leaders. / AFP PHOTO / ANDRZEJ HULIMKA (Photo credit should read ANDRZEJ HULIMKA/AFP/Getty Images)
First Lady Melania Trump (2ndR) and Polish President's wife Agata Kornhauser-Duda (2ndL) show shoes printed by children on a 3D printer as they visit the Copernicus Science Center in Warsaw on July 6, 2017. US President Donald Trump is on his first visit behind the former Iron Curtain. He is expected to focus largely on defence in talks with Baltic, Balkan and central European leaders. / AFP PHOTO / ANDRZEJ HULIMKA (Photo credit should read ANDRZEJ HULIMKA/AFP/Getty Images)
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"The thing I have to mention is that Barack Obama, when he was president, found out about this ... in August. Now, the election was in November," Trump said. "That's a lot of time. He did nothing about it. He was told it was Russia by the CIA, and he did nothing about it."

Trump has been preparing for his scheduled "sideline" meeting with Putin -- an exchange the Kremlin hopes will foster a dialogue between the two nations. According to a New York Times report, top Trump aides are worried about what their boss might say to the Russian president.

Trump wrapped up his remarks on the 2016 election by comparing giving a definitive answer on the matter to the reports that Iraq had weapons of mass destruction during the Iraq war.

"I remember when I was sitting back listening about Iraq,' Trump said. "Weapons of mass destruction, how everyone was 100 percent sure it was weapons of mass destruction. Guess what? That led to one big mess."

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