Trump has said he would "strongly consider" giving written testimony to House impeachment investigators after Speaker Nancy Pelosi challenged him to testify if he thought the proceedings were unfair, as he has routinely charged.
The House impeachment inquiry has failed to move the needle among American voters following two weeks of public hearings, with the exact same number backing impeaching President Trump as the poll found in October.
Nadler said the hearing, which will focus on "Constitutional Grounds for Presidential Impeachment", will take place on December 4.
It's unlikely that the president himself will attend the hearing, as Trump is scheduled to be overseas on December 4 to participate in a summit with North Atlantic Treaty Organisation allies outside London.
Media suggested that during a July 25 call with Ukrainian President Volodymyr Zelensky, Trump could insist that Ukraine investigate into former vice president and Trump's political rival Joe Biden.
"It is clear that the apportionment process has been misused to withhold congressionally enacted appropriations, undermining Congress's constitutional power of the purse and raising serious legal concerns about impounding funds in violation of the Impoundment Control Act of 1974", according to a summary of documents turned over by the Office of Management and Budget that was provided by the committee. The president has tried to keep top aides from testifying, which Democrats say amounts to obstruction of Congress and potential grounds for impeachment.
New polling released earlier this month from the New York Times Upshot with Siena College depicts a troubling picture for Democrats a year out from election day.
Article 1 of the United States constitution gives the House of Representatives the sole power to initiate impeachment and the Senate the sole power to try impeachments of the president.
It's still unclear how long a trial might last, what it would look like and who might be called as witnesses.
House Democrats have been moving full steam ahead with the impeachment investigation against Trump.
"The president has accepted or enlisted foreign nations to interfere in our upcoming elections, including the next one", Schiff said in the letter. "But while we will continue with our investigative work and do not foreclose the possibility of further depositions or hearings, we will not allow the President or others to drag this out for months on end in the courts", calling the inquiry "an urgent matter that can not wait if we are to protect the nation's security and the integrity of our elections".