Trump, however, told Fox News late Wednesday that he "very soon" will produce evidence of Obama's actions. Top leaders of the House Intelligence Committee said Wednesday that Trump's allegation is unfounded, but the president said his administration "will be submitting things" to the panel and that he perhaps will be speaking about his claim next week.

"You're going to find some very interesting items coming to the forefront over the next two weeks," Trump said.

Obama dismissed the allegation as "simply false," and Trump since then has not substantiated his claim until the Fox interview.

One key U.S. senator, Lindsey Graham of South Carolina, said, "I'm going to get to the bottom of this. Congress is going to flex its muscle."

He vowed, if need be, to subpoena the FBI to determine whether any U.S. judge issued a secret wiretapping edict that the FBI carried out.

白宫继续坚持川普总统的说法，就是前总统奥巴马曾下令窃听他在纽约川普大厦的电话。

白宫发言人斯派塞周四面对的满屋记者们想知道为什么在参众两院情报委员会的重要议员表示没有迹象显示川普大厦受到监视时，川普仍坚持窃听一说。斯派塞指责记者们对参议院委员会的情况作出“错误解释”。

他还指责记者们“只挑选”他们想要报道的东西，而忽视了众议院情报委员会主席努涅斯所说的“很可能”发生了对川普的监视。不过努涅斯说，他不认为川普的电话被窃听。

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