President TrumpDonald John TrumpTrump criticizes supposed second whistleblower North Korea missile test raises fears of new capabilities Window narrows for Trump trade deals MORE took aim at a second unnamed intelligence official who is reportedly considering filing a complaint against Trump and testifying before Congress about the president's contacts with Ukraine's president on Saturday.

Trump tweeted that the official, whose identity remains a secret, was a member of the "deep state" conspiracy he has argued is working to undermine his presidency.

"The first so-called second hand information 'Whistleblower' got my phone conversation almost completely wrong, so now word is they are going to the bench and another 'Whistleblower' is coming in from the Deep State, also with second hand info. Meet with Shifty [Rep. Adam SchiffAdam Bennett SchiffTrump criticizes supposed second whistleblower Collins: Trump's call for China to probe Biden 'completely inappropriate' Trump accuses Democrats of 'interfering' with 2020 election and 'continuing to interfere' with 2016 MORE (D-Calif.). Keep them coming!" Trump tweeted.

The first so-called second hand information “Whistleblower” got my phone conversation almost completely wrong, so now word is they are going to the bench and another “Whistleblower” is coming in from the Deep State, also with second hand info. Meet with Shifty. Keep them coming!

— Donald J. Trump (@realDonaldTrump) October 6, 2019

Trump's referral to "shifty" Rep. Adam Schiff (D-Calif.), chair of the House Intelligence Committee, appeared to be a reference to Republican efforts to discredit House Democrats' impeachment inquiry as well as the first whistleblower to raise concerns about his conversations with Ukrainian President Volodymyr Zelensky.

Republicans have argued that the first whistleblower, who met with a member of Schiff's congressional staff before filing a complaint, is a partisan operative who did not have first-hand knowledge of Trump's conversations.

Democrats argue that a readout of Trump's July phone call with Zelensky, during which he repeatedly asked Zelensky to open an investigation into former Vice President Joe BidenJoe BidenTrump criticizes supposed second whistleblower North Korea missile test raises fears of new capabilities Trump told House Republicans that he made Ukraine call because of Perry: Report MORE, proved the whistleblower's concerns to be true.