CLEVELAND - President Donald Trump on Tuesday didn’t condemn white supremacist groups and their role in violence in some American cities this summer, branding it solely a “left-wing” problem and telling one far-right extremist group to “stand back and stand by."However, the president's campaign insisted in an interview with Fox News that Trump denounced white supremacist groups "twice" during the first presidential debate on Tuesday in Cleveland.“Almost everything I see is from the left wing, not from the right wing," said Trump, whose exchange with Democrat Joe Biden left the extremist group Proud Boys celebrating what some of its members saw as tacit approval.He was responding to a question from debate moderator and "Fox News Sunday".