Hours after Trump tweeted, Obama's spokesman said Trump's wiretapping accusation is "simply false".

"A cardinal rule of the Obama Administration was that no White House official ever interfered with any independent investigation led by the Department of Justice," Obama spokesman Kevin Lewis said in a statement.

"As part of that practice, neither President Obama nor any White House official ever ordered surveillance on any U.S. citizen. Any suggestion otherwise is simply false," said Lewis.

Since then, the White House has been under mounting pressure from the Capitol requesting evidence that the phones at Trump Tower were tapped during the elections.

"I think the president has one of two choices: either retract or to provide the information that the American people deserve, because, if his predecessor violated the law, President Obama violated the law, we have got a serious issue here, to say the least," John McCain, Chair of the Senate Armed Services Committee, said Sunday.

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