It was on July 25 that US President Donald Trump had a roughly 30-minute conversation with Ukrainian President Volodymyr Zelenskyj, which is now the reason for the whistleblower's written complaint.

"Within the framework of my post, I have received information from several US officials that the US president is using the power of his office to enable another country to take part in the 2020 US election," reads the whistleblower report.

"This interference includes, among other things, pressure for another country to investigate one of the president's foremost political rivals."

The whistleblower has not witnessed this himself, but refers to at least six different sources within the state apparatus that have reported this in a consistent way.

Tried to keep secret

The whistleblower has also received information that the White House has tried to keep all documentation of the conversation in question secret.

On Wednesday, it was a slightly muted Donald Trump holding his first press conference since the Democrats launched an investigation into putting him before state law. He then denied that he had done anything wrong and called the Democrats' demand for national law a joke.

-When they (the Democrats) share the information available, this witch hunt will hit them hard. It's a joke, the president said.

- National law for what? To have had a fantastic meeting or a fantastic phone call ?, he continued.

The origin of the investigation is a telephone conversation between Donald Trump and Ukrainian President Volodymyr Zelenskyj on July 25. In the conversation, Trump should have made "alarming" promises to foreign power, according to a report by a whistleblower in the US security service.

A transcript of the conversation between the presidents was published yesterday. It shows that Trump asked Zelenskyj to take a closer look at the rumors that Democratic presidential candidate Joe Biden stopped a charge against his son, who sat on the board of a Ukrainian gas company.

The text is updated.