Story highlights Trump refused to dive deeper into his comments

The White House has refused to provide evidence to back up Trump's claims

(CNN) President Donald Trump suggested Monday he still believes his unsubstantiated allegations that President Barack Obama illegally tapped his phones during the 2016 campaign.

"I think our sides 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 that's a very big topic. And it's a topic that should be No. 1, and we should find out what the hell is going on," Trump said in an interview with CBS' John Dickerson that aired Monday morning.

"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," he added.

In March, Trump claimed in a series of tweets that Obama ordered Trump's phones wiretapped during the presidential campaign. Trump never provided evidence for the claims, and he and his aides have since walked back aspects of the claim, insisting Trump was referring to any kind of surveillance of his campaign or associates.

Trump broached the topic in his interview by saying he has had "some difficulties with Obama."

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