President Trump on Wednesday tweeted a warning to Democrats who have threatened to investigate him upon reclaiming a majority in the House of Representatives:

"If the Democrats think they are going to waste Taxpayer Money investigating us at the House level," Trump said, "then we will likewise be forced to consider investigating them for all of the leaks of Classified Information, and much else, at the Senate level."

If the Democrats think they are going to waste Taxpayer Money investigating us at the House level, then we will likewise be forced to consider investigating them for all of the leaks of Classified Information, and much else, at the Senate level. Two can play that game! — Donald J. Trump (@realDonaldTrump) November 7, 2018

Last December, President Trump's son, Don Jr. called on the House intelligence Committee to investigate information that was leaked from his closed interview the week before.

"This committee should determine whether any member or staff member violated the rules by leaking information to the media concerning the interview or by purposely providing inaccurate information which led to significant misreporting," said Trump Jr.'s attorney, Alan Futerfas.

In addition, his letter charges that members of the House committee “began disseminating wildly inaccurate information” to reporters that formed the basis of an erroneous CNN report on an email that Mr. Trump and other members of the Trump campaign received in September 2016. The CNN report relied on two unnamed sources who described an email purporting to show that Mr. Trump and other campaign officials had received advance notice about a cache of hacked Democratic documents that were about to be posted by WikiLeaks, the anti-secrecy group. In fact, the email had been sent the day after the cache was posted publicly. CNN later corrected its story. -NYTimes

"These disturbing circumstances warrant examination," concluded Futerfas.

Rep. Adam Schiff (D-CA), who will lead the House Intelligence Committee, told the Los Angeles Times on Monday that he will revive the investigation into so-called "Russian collusion" - vowing to go after Trump's personal business interests.

"The president has sought to keep that off limits, but if that’s the leverage Russians pose that’s a real threat to our country," said Schiff.

Schiff insisted in March that there was "more than circumstantial evidence" connecting Trump to Russia, however despite the best efforts of the US-UK-Australian intelligence community and the DOJ/FBI's multi-year counterintelligence "sting" and now probe, no such evidence has emerged.

Rep. Maxine Waters (D-CA), meanwhile, who has repeatedly called to impeach President Trump, is set to lead the House Financial Services Committee. As chair, she will be able to subpoena officials at financial regulatory agencies for testimony and other information.

In September, Waters renewed her calls to impeach Trump - and told a crowed of constituents at a rally that she would "get" Vice President Mike Pence once Trump was gone.

"I had a conversation here today with someone [who] asked, ‘Well, what about Pence? If you are able to impeach, Pence will be worse,’" said Waters. "And I said, ‘Look, one at a time. You knock one down, one at a time. You knock one down, and we’ll be ready for Pence. We’ll get him, too."