WASHINGTON (Reuters) - President Donald Trump's first public accountability session began in the House of Representatives on Monday for possible pressure on Ukraine to intervene in the 2020 US presidential election. Republicans have questioned the credibility of parliamentary investigations.

The head of the House Intelligence Committee Adam Schiff at the opening of the first public accountability sessions; Trump asked his Ukrainian counterpart Volodymyr Zelinsky to investigate the activities of the son of the former US vice president for political purposes.

Schiff said he hoped the hearings - expected to be followed by tens of millions of viewers - would reveal the president's practices and abuse of power.

Rationale for accountability
The same speaker reviewed the facts and facts of the issue of parliamentary accountability for Trump on what became known as the scandal, "Ukraine Gate," starting from the telephone conversation between President Trump and his Ukrainian counterpart on July 25, through the testimony of witnesses before the House of Representatives, as well as text messages exchanged by US diplomats on Ukraine.

Secret parliamentary hearings also revealed that the Trump administration had withheld security aid from Ukraine approved by Congress as a means of pressuring Kiev to investigate Joe Biden and his son over a corruption case linked to an energy company in Ukraine whose board was Joe Biden's son.

Adam Schiff said that the current investigations are necessary within the role of Congress, which is a constitutional institution parallel to the institution of the presidency.

The Democrats, who are leading the House, summoned two US diplomats who, in closed-door briefings, expressed concern about Trump's dealings with Ukraine, to provide more details of those concerns under the media lenses: Acting US Ambassador to Ukraine Lean Taylor and George Kent, a deputy. The US Assistant Secretary of State for European Affairs oversees the Ukrainian portfolio at the ministry.

Acting US ambassador to Ukraine said that there was an unofficial diplomatic channel between the US and Ukraine, and that the participants in this channel include US officials, including Trump's special lawyer Rudy Giuliani, and was putting conditions on the Ukrainian authorities in exchange for a meeting between the Ukrainian president and his American counterpart, The release of US aid to Kiev, one of which is to open an investigation into Joe Biden and his son.

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Republican attack
In contrast, Chief Republican Devin Nunes attacked the Trump parliamentary inquiry, saying that everything was a play, and that Democrats were trying to topple the president from the very beginning with evidence from Special Investigator Robert Mueller's investigation into the possible involvement of the Trump campaign with the Russian government in order to intervene. The 2016 presidential election.

Trump's Republicans, who control the Senate, have developed a defense strategy based on President Trump's mistake when he asked Ukraine's new president to investigate Joe Biden's possible rival in the 2020 presidential election.

Trump has denied any wrongdoing on Ukraine, rebuking some former and current officials who appeared before parliamentary committees, calling them "human scum" and calling the investigation a political prosecution aimed at undermining the chances of his re-election.

The president commented on Tuesday that public hearings began, saying Democrats were putting their interests ahead of the nation.

The start of public hearings follows a series of secret hearings by three committees in the Democratic-controlled House of Representatives in the past few months, paving the way for the indictment of President Trump.