Trump had previously asserted by tweet that President Obama had placed an illegal “tapp” on Trump, but provided no evidence.

In an interview held in the Oval Office with CBS’ John Dickerson, when asked to elaborate on his claims, Trump abruptly ended the interview.

RESIDENT DONALD TRUMP: — and I thought that — well, you saw what happened with surveillance. And I think that was inappropriate, but that’s the way–
 
JOHN DICKERSON: What does that mean, sir?
 
PRESIDENT DONALD TRUMP: You can figure that out yourself.
 
JOHN DICKERSON: Well, I– the reason I ask is you said he was– you called him “sick and bad”.
 
PRESIDENT DONALD TRUMP: Look, you can figure it out yourself. He was very nice to me with words, but– and when I was with him — but after that, there has been no relationship.
 
JOHN DICKERSON: But you stand by that claim about him?
 
PRESIDENT DONALD TRUMP: I don’t stand by anything. I just– you can take it the way you want. I think our side’s been proven very strongly. And everybody’s talking about it. And frankly it should be discussed. I think that is a very big surveillance of our citizens. I think it’s a very big topic. And it’s a topic that should be number one. And we should find out what the hell is going on.
 
JOHN DICKERSON: I just wanted to find out, though. You’re– you’re the president of the United States. You said he was “sick and bad” because he had tapped you– I’m just–
 
PRESIDENT DONALD TRUMP: You can take– any way. You can take it any way you want.
 
JOHN DICKERSON: But I’m asking you. Because you don’t want it to be–
 
PRESIDENT DONALD TRUMP: You don’t–
 
JOHN DICKERSON: –fake news. I want to hear it from–
 
PRESIDENT DONALD TRUMP: You don’t have to–
 
JOHN DICKERSON: –President Trump.
 
PRESIDENT DONALD TRUMP: –ask me. You don’t have to ask me.
 
JOHN DICKERSON: Why not?
 
PRESIDENT DONALD TRUMP: Because I have my own opinions. You can have your own opinions.
 
JOHN DICKERSON: But I want to know your opinions. You’re the president of the United States.
 
PRESIDENT DONALD TRUMP: Okay, it’s enough. Thank you. Thank you very much.

Time – President Trump Suddenly Ends Interview When Asked About Obama Wiretapping Claim
CNN Money – Trump abruptly ends interview with CBS’ Dickerson after wiretapping questions
CBS News – President Trump’s interview in the Oval Office: Full Transcript