Leader of the Democratic House of Representatives team, Adam Schiff, who is prosecuting the trial of US President Donald Trump before the Senate, said on Sunday that he believed the Republican Party leader intentionally threatened him when he said on Twitter that he had "not paid the price yet".

Earlier on Sunday, Trump launched a new attack on Democrats, led by Schiff, against the backdrop of the Senate trial, and he said on Twitter: “The elusive Adam Schiff is a corrupt politician and perhaps a very sick man. He has not yet paid the price for what he has done to our country. ”

In response to a question in an interview with NBC television, whether he considered this a threat, Schiff said: "I think it was intended."

Trump's attack on Schiff and other Democrats comes days after they defended the president's trial before the Senate on charges of abuse of power by pressuring Ukraine to investigate a political rival and then seeking to block the investigation in Congress.

Schiff, head of the House Intelligence Committee and head of the prosecution team at Trump's trial, played a pivotal role in the efforts of Democrats to display Trump's behavior as a threat to democracy in America and around the world in defenses before the Republican-dominated Senate where Trump is likely to be acquitted.

Schiff, a California lawmaker and former federal prosecutor, has been the target of frequent attacks by Trump and his Republican supporters in Congress.

Trump's attorneys began defending the president on Saturday, saying that Democrats' efforts to remove him from office would be a "very dangerous" precedent in the election year.