The pre-lunch meeting was also attended by former USA football player Jim Brown and Trump's son-in-law Jared Kushner. West said. "When we make everything in China and not America, we're cheating on our country".
Trump told reporters at Trump Tower that the they had been "friends for a long time".
Trump, who has had low approval ratings from African-Americans, often links the support of West and Brown to his administration's relationship with the black community.
It has rarely happened before in this administration, but on Thursday afternoon, Donald Trump wasn't the most puzzling figure sitting in the Oval Office.
"It was something about when I put this hat on, it made me feel like Superman", West said.
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West credited Trump with stopping a potential war with North Korea and is encouraging Trump to swap his usual Air Force One jet for a hydrogen-powered plane.
According to reports out of the room where the meeting took place, West spoke for a solid 10 minutes, said he had been misdiagnosed with bipolar disorder and also said he's sleep-deprived.
Mr Trump said: "That's really nice". "He might not have thought he'd have a insane motherfucker like Kanye West's support and best believe, we are going to make America great".
"I love Hillary, I love everyone, right".
"A liberal will try to control a black person through the concept of racism because they know that we are very proud emotional people", West said.
West has made headlines today about his behavior during the sit-down. which included a couple classic Kanye rants, a heap of Trump praising and even a hug between the two men.
Kanye also said that he told Trump he was going to create a factory in Chicago called Larry's - a homage to Gangster Disciples leader, Larry Hoover - where he'll hire ex-inmates to make his "Make America Great" hat as well as other items.
West has returned the love, bucking left-leaning showbiz trends to come out as a Trump supporter, complete with the red Make America Great Again baseball cap most often seen at the president's rowdy election campaign rallies - where African Americans are often hard to spot.