Republican Senator Rand Paul is urging President Donald Trump to use lie detector tests to root out the author of the anonymous New York Times op-ed.

'If you have a security clearance in the White House I think it would be acceptable to use a lie detector test and ask people whether they are talking to the media against the policy of the White House,' he said Thursday on Capitol Hill.

'I think it's not unprecedented for people with security clearances to be asked to whether or not they were revealing things against the law under oath and also by lie detector. We use a lie detector test routinely for CIA agents and FBI agents,' he noted.

Republican Senator Rand Paul is urging President Donald Trump to use lie detector tests to root out the author of the anonymous New York Times op-ed

Paul was the senator who urged Trump to revoke John Brennan's security clearance

He also said it could be a danger to the country if the author was releasing classified information.

'This could be very dangerous if the person who is talking to the media is actually revealing national security secrets. So, yes, I think we need to get to the bottom of it,' the senator said.

Paul was the senator who urged Trump to remove former CIA director John Brennan's security clearance, which the president did.

The essay in the Times has caused an uproar in the Trump White House and led to a furious response from the president, who wants to know who wrote it.

Melania Trump, Vice President Mike Pence and every Cabinet member has denied being the author of the piece that outlines a conspiracy by White House staff to keep Trump from causing harm to the country and revealed discussions about invoking the 25th amendment to remove him from office.

Trump himself has called the writer 'gutless' and called on the newspaper to release the identity in the name of national security.

'Does the so-called 'Senior Administration Official' really exist, or is it just the Failing New York Times with another phony source?' Trump tweeted hours after the newspaper published a brutal opinion essay that the newspaper said was written by one of his senior-level appointees.

President Trump wants to learn the identity of the author

The op-ed piece in the New York Times revealed a 'quiet resistance' in the Trump administration

'If the GUTLESS anonymous person does indeed exist, the Times must, for National Security purposes, turn him/her over to government at once!'

White House press secretary Sarah Huckabee Sanders called on the author to 'do the right thing and resign.'

In an online introduction, the Times says the author's 'identity is known to us' and the person's 'job would be jeopardized by its disclosure. We believe publishing this essay anonymously is the only way to deliver an important perspective to our readers.'

The essay describes a 'quiet resistance' that by its nature has remained secret but isn't designed to bring Trump down – only to curb his worst impulses.

'Ours is not the popular 'resistance' of the left,' the author writes. 'We want the administration to succeed and think that many of its policies have already made America safer and more prosperous.'

'But we believe our first duty is to this country, and the president continues to act in a manner that is detrimental to the health of our republic.'

So rather than risk the invocation of the Constitution's 25th Amendment, the prescribed route for removing a president, he boasts that 'we will do what we can to steer the administration in the right direction until – one way or another – it's over.'