Vice President Joe Biden on Thursday told President-elect Donald Trump to “grow up” and face the reality of governing the country as its president.

“Grow up, Donald, grow up. Time to be an adult, you’re president,” Biden said in an interview with PBS NewHour. “You’ve got to do something. Show us what you have. You’re going to propose legislation, we’re going to get to debate it. Let the public decide. Let them vote in Congress. Let’s see what happens.”

“It’s going to be much clearer what he’s for and against, and what we’re for and against, now that it’s going to get down to actually discussing, in detail, these issues that affect people’s lives,” Biden continued.

Biden was responding to a question posed by NewsHour host Judy Woodruff, who asked about the “new reality” of Trump’s Twitter use as a method of communication. Woodruff mentioned two recent tweets in particular in which Trump attacked President Barack Obama and new Senate Minority Leader Chuck Schumer (D-NY):

The Democrats, lead by head clown Chuck Schumer, know how bad ObamaCare is and what a mess they are in. Instead of working to fix it, they.. — Donald J. Trump (@realDonaldTrump) January 5, 2017

Doing my best to disregard the many inflammatory President O statements and roadblocks.Thought it was going to be a smooth transition – NOT! — Donald J. Trump (@realDonaldTrump) December 28, 2016

Watch below via PBS:

