WASHINGTON (Reuters) - The House of Representatives Intelligence Committee has released its report investigating the possible prosecution of President Donald Trump in parliament, saying the president made a months-long effort to use his position to seek foreign intervention in his favor in the 2020 election.

The report said President Trump had required his Ukrainian counterpart Volodymyr Zelinsky to declare investigations with Joe Biden's son in return for a visit to the White House and the resumption of military aid.

He said Trump's representatives had stepped up pressure on the Ukrainian president to ensure he announced an investigation against Biden and his son.

According to the report, Trump asked President Zelinsky to adopt an unconfirmed theory that Ukraine, not Russia, intervened in the 2016 presidential election.

He noted that Trump had intimidated witnesses who complied with subpoenas, and that he placed his personal and political interest above the US.

The report also noted that Trump's plan had a negative impact on US foreign policy towards Ukraine and undermined the country's national security.

He said the evidence that could lead to Trump's dismissal because of his use of office and obstruction of Congress is "enormous."

The committee is scheduled to meet again to vote on its findings, and will then be referred to the Judicial Committee of the House of Representatives to begin its proceedings on Wednesday.

In London, Trump said he wanted his administration to testify, including Secretary of State Mike Pompeo, but only during a Senate trial.

Trump has previously refused to allow his administration officials to testify in the House inquiry.