President-elect Donald Trump said Sunday he intends to deport or incarcerate as many as 3 million undocumented immigrants once he takes office.

“What we are going to do is get the people that are criminal and have criminal records, gang members, drug dealers, where a lot of these people, probably two million, it could be even three million, we are getting them out of our country or we are going to incarcerate,” Trump told CBS’s US:CBS Lesley Stahl during an interview on “60 Minutes” to be aired Sunday night. “But we’re getting them out of our country, they’re here illegally.”

Read: Trump names RNC chief Reince Priebus as chief of staff

Trump said that after tackling the criminal element and securing the borders, “we are going to make a determination” on what to do with other undocumented immigrants. “They’re terrific people but we are gonna make a determination at that,” Trump said.

Trump also said he’s determined to build a wall along the border with Mexico, but will accept fencing in some places. “For certain areas, I would. But for certain areas a wall is more appropriate,” Trump said. “I’m very good at this. It’s called construction.”

Donald Trump's Priorities in First 100 Days

He also credited social media for his stunning election victory, and said he planned to remain active on Twitter, though “I’m going to be very restrained.”

“It’s a great form of communication,” Trump said of Twitter TWTR, +6.08% , Facebook FB, -2.24% and Instagram, where he said he has a combined 28 million followers. “I think it helped me win all of these races where they’re spending much more money than I spent. And I won. I think that social media has more power than the money they spent, and I think maybe to a certain extent, I proved that,” Trump said.

Also read:Trump tells supporters to stop harassment

In other parts of the interview, Trump:

— Said he had not made up his mind on whether to appoint a special prosecutor to investigate Hillary Clinton. “They’re good people. I don’t want to hurt them,” he said of the Clintons.

— Said the issue of same-sex marriage was settled by the Supreme Court and he’s “fine” with that. He did not find abortion as settled, saying that if Roe vs. Wade were to be overturned, women seeking abortions “perhaps have to go — they’ll have to go to another state. . . . That has a long, long way to go,” he said.

— Said that while he plans to “drain the swamp” of Washington insiders, he has no choice but to hire them now. “That’s the problem with the system,” he said. “The whole place is one big lobbyist.” Trump said he would phase them out of his administration over time.

— Said he won’t put his business into a blind trust, but doesn’t need a salary as president. “I think I have to by law take $1, so I’ll take $1 a year.”