But West was not entirely supportive of Trump's agenda, noting that he would discuss "stop and frisk" with the president.
The focus was the 2016 presidential election and Hillary Clinton, as West wore a red "Make America Great Again" hat. "That was quite something". West also argued that Trump deserved more respect, saying: "if he don't look good, we don't look good". Nike drew criticism last month for featuring Kaepernick in a major marketing campaign for the 30th anniversary of its "Just Do It" slogan, with some arguing that the brand had aligned itself with a divisive political stance.
Following West's statement, Mr Trump said: "I tell you what that was pretty impressive".
In an interview with Fox News before the meeting, Trump said the justice system was "very unfair to African-Americans it's very unfair to everybody".
But West isn't the only star at the White House Thursday.
"I didn't even know whether he's going [to see] Trump". But he said "this hat, it gives me power".
The rapper, who is from Chicago, also urged Mr Trump to abandon stop-and-frisk policing.
West said he was diagnosed with bipolar disorder, but then that he was misdiagnosed, and was simply sleep-deprived.
Trump says he'd been willing to "look at it", and says, "They have to do something".
West also had some clarification about his mental health.
West ended a September 29 performance of "Saturday Night Live" by delivering an unaired pro-Trump speech that drew catcalls from the audience.
West's wife, Kim Kardhashian, has worked with Trump and the White House on prison reform and pardon issues.
West said he was raising the case of a 68-year-old prisoner.