U.S. President Barack Obama speaks after receiving an honorary doctorate of laws during the 250th anniversary commencement ceremony at Rutgers University on May 15, 2016 in New Brunswick, New Jersey. Obama is the first sitting president to speak at the school's commencement.

U.S. President Barack Obama speaks after receiving an honorary doctorate of laws during the 250th anniversary commencement ceremony at Rutgers University on May 15, 2016 in New Brunswick, New Jersey. Obama is the first sitting president to speak at the school’s commencement.

*After President Obama spoke out against ignorance during a commencement speech at Rutgers University on Sunday, Donald Trump responded Monday evening with a tweet.

“Class of 2016, let me be as clear as I can be: In politics and in life, ignorance is not a virtue,” said Obama, a remark widely interpreted as criticism of Trump.

Trump’s response tweet: “This is a primary reason that President Obama is the worst president in U.S. history!”

trump tweet ignorance

Ooh burn. *sarcasm*

U.S. President Barack Obama receives an honorary doctorate of laws while attending the 250th anniversary commencement ceremony at Rutgers University on May 15, 2016 in New Brunswick, New Jersey.

Without naming the presumptive Republican nominee, Obama went on to criticize a number of key Trump policies, including “building walls,” “disparaging Muslims” and “not knowing what you’re talking about.”

Per CBS News:

“Facts. Evidence. Reason. Logic. An understanding of science,” Mr. Obama said. “These are good things. These are qualities you want in people making policy. These are qualities you want to continue to cultivate in yourselves as citizens.”

“We traditionally have valued those things, but if you were listening to today’s political debate, you might wonder where this strain of anti-intellectualism came from,” he continued. “So class of 2016, let me be as clear as I can be: in politics and in life, ignorance is not a virtue. It’s not cool to not know what you’re talking about. That’s not keeping it real or telling it like it is. That’s not challenging political correctness, that’s just not knowing what you’re talking about. And yet we’ve become confused about this.”

Watch clips of Obama’s Trump shade below: