Donald Trump fixates on Elizabeth Warren as Obama criticizes his proposals

Donald Trump is continuing his name-calling of Sen. Elizabeth Warren as President Obama unleashes his harshest criticism yet of the presumptive Republican nominee’s proposals and knowledge of international affairs. Appearing on “Jimmy Kimmel Live!,” Trump was questioned on previous positive statements he’s made about Hillary Clinton and how his statements have changed over time. NBC’s Halle Jackson reports for TODAY.May 26, 2016