Amid a continuing game of political chicken between the White House and Democrats, President Trump plans to send a letter to House Speaker Nancy Pelosi “daring” her to hold a vote on launching an impeachment inquiry into him.

The letter, which will be sent to the California Democrat on Friday, will tell her that the White House doesn’t plan to comply with demands for documents related to an impeachment investigation into Trump because there was no official vote held on the House floor, according to Fox News.

Despite the lack of an official vote, Pelosi announced last week that a formal impeachment inquiry had been launched into allegations from a whistleblower that Trump unduly pressured Ukrainian President Volodymyr Zelensky to begin an investigation into his political rival Joe Biden and into potential meddling in the 2016 presidential election, both topics that could help him politically in the runup to the 2020 elections.

Trump has denied all wrongdoing, repeatedly characterizing a July 25 call between him and Zelensky that is central to the complaint as “perfect” and accusing Democrats of launching a “witch hunt” against him.

Late Thursday night, a number of texts were released from exchanges between U.S. Ambassador to the European Union Gordon Sondland, former State Department envoy to Ukraine Kurt Volker, and Chargé d’Affaires William Taylor both before and after the July 25 call in question.

In one text from September, Taylor expressed concern to Sondland about the politics of withholding military aid to the Eastern European country.

“As I said on the phone, I think it’s crazy to withhold security assistance for help with a political campaign,” Taylor wrote, with Sondland responding in writing that there was no “quid pro quo” and rather that Trump was seeing if Zelensky was really aiming to “adopt the transparency and reforms” he promised.

In another text on the morning of the July 25 call, Volker wrote to Zelensky’s adviser Andriy Yermak and said that a sought-after visit to Washington was contingent on the Ukrainian government pursuing investigations that Trump wanted.

“Good lunch — thanks. Heard from White House — assuming President Z convinces Trump he will investigate / 'get to the bottom of what happened' in 2016, we will nail down date for visit to Washington. Good luck! See you tomorrow — Kurt,” Volker texted.

Volker resigned suddenly from his role last Friday and testified before lawmakers in a marathon session Thursday.

It isn’t clear what the contents of the Friday letter from the White House to Pelosi will contain, but the tone may match that of a letter sent by House Minority Leader Kevin McCarthy of California demanding she halt the impeachment inquiry until a set of questions are answered.