Robert De Niro is not mincing words when it comes to Donald Trump’s victory, saying the Republican’s win has left him mourning similar to how he felt after 9/11.

“I feel like I did when the World Trade Center was attacked,” De Niro says in an interview with the Associated Press.  “I’m stunned but we are going to see.”

The Oscar-winning actor has been outspoken in his anti-Trump stance throughout the U.S. presidential race, lambasting the now president-elect as a “con” and a “dog” among other things, going so far as to call him “blatantly stupid” and a “bulls*** artist.”   After making a video last month saying he would like to punch Trump in the face, De Niro is now willing to let Trump prove himself.

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“I’m going to give him the benefit of the doubt, we’ll see what happens,” he says, though he won’t let Trump off the hook too easily, promising that he – and the world – will be watching him closely.

“This was about world order, doing things that are trying to work our way through a lot of problems internationally and domestically. And you need a grown-up for that and we’re going to see,” he says. “He’s there, we are all waiting but we are watching.”