In the age of Obama, everything must be politicized.
Obama turned a commencement speech at Rutgers University into a campaign-style rally filled with attacks on Republican frontrunner Donald Trump.
Instead of asking undergraduates to reflect on their time as students or asking them to ponder what life they wanted to make as they mature into adults, Obama used his Rutgers commencement speech to kickoff the 2016 general election.

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NBC News reports on Obama’s remarks:

Trumps responding tweet:
Donald J. Trump    
✔ ‎@realDonaldTrump
"In politics, and in life, ignorance is not a virtue." This is a primary reason that President Obama is the worst president in U.S. history!