President Donald Trump is attempting to brush back Democrats vowing to commence extensive oversight of his administration by threatening to unleash 'devastating' classified information he would put out as a form of retaliation.

Trump has already spent months calling to declassify materials he claims will show the FBI in a bad light, and his own Justice Department has negotiated with congressional Republicans over documents they demanded be put out in unredacted form.

Now, with Democrats set to take over powerful investigative committees in January, Trump is trying to avoid oversight by threatening punitive countermeasures.

GLOVES OFF: President Trump is threatening to declassify documents if Democrats engage in what he called 'harassment'

'If they go down the presidential harassment track, if they want go and harass the president and the administration, I think that would be the best thing that would happen to me,' Trump said.

'I'm a counter-puncher and I will hit them so hard they'd never been hit like that,' he told the New York Post.

He didn't specify what would constitute harassment versus legitimate oversight that Congress has routinely exercised for years, although the Trump administration has had little trouble contending with the Republican-run House and Senate.

Trump's language didn't dwell on the substantive merits of the material he might put out.

'I think that would help my campaign. If they want to play tough, I will do it. They will see how devastating those pages are,' Trump warned.

He told the paper holding back was to his advantage. 'It's much more powerful if I do it then, because if we had done it already, it would already be yesterday's news,' he said.

House Republicans have wanted to put out un-redacted materials from the start of the Russia probe, including the surveillance warrants for Trump foreign policy advisor Carter Page. Such information, if out, could potentially aid Trump's effort of muddying investigators who have been pursuing his associates. They claim it would show FBI malfeasance.

'If they want to play tough, I will do it,' Trump threatened

Trump has also pushed for the release of texts and emails involving fired FBI director James Comey and ousted FBI lovers Peter Strzok and Lisa Page, only to face internal pushback.

Democrats have been threatening a raft of investigations of the adminsitration, even as party leaders have tamped down talk of impeachment.

As part of the probes, Trump's family businesses could get a fresh look, as could recent disclosures that Ivanka Trump used personal emails when she first joined her father's staff.

Probes could cover the hurricane related deaths in Puerto Rico, provide a venue for Robert Mueller to testify, or force cabinet officials to justify their jet travel.