US President Donald Trump has accused his opponents of wasting time for initiating measures to isolate him, while Democrats have warned the president and his associates against interfering in the work of Congress, a reason for isolation under the US Constitution.

"Democrats who do nothing should focus on our country instead of wasting everyone's time and energy on nonsense," Trump wrote on Twitter.

He also called on the chairman of the House Intelligence Committee, Adam Schiff, to resign and accused him of fraud.

"Congressman Adam Schiff must resign because of the crime of falsifying a copy of my conversation with the president of Ukraine that was perfect and present it to Congress," Trump said in a tweet.

Schiff said at a news conference on Wednesday that any interference in the work of Congress would be a sign of obstructing the conduct of the Board's investigation into the removal of Trump.

At a news conference, he warned Secretary of State Mike Pompeo against forbidding any official to testify before Congressional committees as part of that investigation.

"We want to make it clear that any effort by Secretary (Pompeo), President (Trump) or any other person to interfere in the ability of Congress to summon anyone to testify will be considered a hindrance to the legal functions of Congress."

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Trump attack
According to US media, accusations of obstruction of Congress are among the reasons for the impeachment of the president under the US Constitution.

Demonstrating their determination to maintain pressure, Democrats in Congress threatened to force the administration to provide them with the documents they requested. Deputies will formally give the administration an ultimatum to hand over the documents on Friday if they do not receive them until that day.

"We are not confused in this regard," Schiff said. "We do not want to be stalled for months as it seems from the government's tactic."

Since returning from the UN General Assembly in New York last Thursday, Trump has been very offensive with his tweets, but he has largely avoided questions about the substance of the issue by asking his Ukrainian counterpart Volodymyr Zelinsky to investigate Joe Biden, who may be his rival in the 2020 election.

On Sunday, Trump referred to a pastor who spoke of the dangers of a "civil war" and suggested on Monday the arrest of a Democratic lawmaker for "treason" and condemned on Tuesday a "coup" aimed at him.

"I have come to the conclusion that what is happening is not an accusation, but a coup aimed at seizing power from the people, on voting, on freedoms, on the second (constitutional) amendment, on religion, on the army, on its border wall and on the rights that God gave us as a citizen of the United States," Trump wrote. American. "

Trump's words were surprising in Washington, where the head of the Council on Foreign Relations, Richard Haass, said the border had been crossed.

He denounced Trump's remarks aimed at "undermining institutions," saying it was "disturbing" that Trump and his envoys were "describing a coup d'état while the procedure is stipulated in the constitution."