He used $400 million in exchange for a promise made by Volodymyr Zelenskiy to investigate political opponents and his son Hunt Biden, a director of a Zelenskiy energy company.
Congress approved the use of financial resources to help resist Russian aggression.
"The Commission is investigating the extent to which it threatens national security, including putting pressure on the intervention to intervene in the 2020 general elections, pending the approval of the Congress for helping to defend military aggression against Russia, and covering up these events," a statement by the three committees led by the house of representatives said.
He is a popular candidate for the Democratic presidential nomination and is expected to win the second term in November 2020.
They said the Defense Department and the White House Budget Authority must hand in documents by October 15.
Defense Ministry spokesman Jessica Maxwell said the Defense Department is ready to cooperate with Congress on issues related to Ukraine aid.
In recent weeks, the House Intelligence Committee, the Supervisory Committee and the Foreign Affairs Committee have issued subpoenas to the State Department and the White House.
As the democratic party pushed ahead with the impeachment case against Trump, they summoned several US diplomats to attend closed door hearings in Capitol Hill this week, and the White House tried to slow down the impeachment process.
He denied that he had any inaccuracy in the call in July 25th. He asked Ze Lens Ki to cooperate with his private attorney Rudolf (Giuliani William) and the US Attorney General Barr (William Barr) on the phone. The White House released a summary of the call.
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