Trump is expected to discuss the probe's conclusion at a Thursday rally in Grand Rapids, Michigan.
Trump's critics immediately pounced on the new story, the latest of several versions of events about a meeting for which emails were discovered between the president's eldest son and an intermediary from the Russian government offering damaging information about Trump's opponent, Hillary Clinton.
Trump's comments came at the start of the third week of a partial government shutdown resulting from the dispute that has left hundreds of thousands of federal workers idled or without paychecks.
Trump's slightly more than hourlong speech was mostly off-the-cuff, with Trump referring only to notes of talking points, without a teleprompter. Trump made clear he was not giving a speech. "It's not anything. It's just we're sort of — it's a celebration."
Trump said on Monday that "it wouldn't bother me at all" if the report were released, but that it was Barr's decision.
Trump was alleged to have pressed Ukrainian President Volodymyr Zelensky into launching investigations that could politically benefit him. Furthermore, the White House allegedly tried to cover it up after House Speaker Nancy Pelosi initiated an impeachment inquiry in September.
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Trump sparked global controversy in recent days after re-posting what critics say are anti-Muslim social media posts from a Britain-based far right group that allegedly depict violence carried out by Muslims. The authenticity of the videos in the posts has not been verified.
Trump also tweeted about a recording that resurfaced this week of a 2015 speech that Bloomberg gave in Aspen, Colorado, defending the "stop-question-and-frisk" policy of the New York City Police Department while he was mayor.
Trump still faces a lawsuit making similar claims brought by a group of more than 200 Democratic Party lawmakers. A judge in Washington has issued key preliminary rulings against Trump, who on Monday asked an appeals court to halt the case.
Trump made the remarks before meeting with South Korean President Moon Jae-in at the White House. It was the first time Trump raised doubts about the Singapore summit so explicitly.