The game of US aid to warring Ukraine is central to the ongoing judicial process against President Donald Trump, who is suspected of exercising some form of blackmail to persuade Ukraine to conduct a public inquiry against his political opponent Joe Biden.

The investigators find that the White House budget office "withheld the assets for a political reason, which is not allowed" under the law stipulating in which situations a US president may withdraw such payments without the approval of Congress.

Went to Congress

In this case, Congress had decided and earmarked the money for Ukraine, which lies in an armed conflict with separatists who receive extensive support from Russia. In the White House, measures were taken to actively make the money inaccessible, according to the investigation.

"A credible enforcement of the law does not allow the president to choose his or her own political priorities before those that Congress has legislated," the review agency reports.

This agency - the Government Accountability Office - is a federal authority that investigates and conducts audits within the entire state administration, which corresponds roughly to the Swedish National Audit Office.

"Knew what was going on"

In the lawsuit against Donald Trump, the U.S. House of Representatives has made allegations of how Trump extorted Ukraine. The process will now begin in the Republican-run Senate, where it is highly unlikely that two-thirds of the senators will vote for the president.

On Wednesday, however, Trump became even closer to the Ukraine legacy, when a man who worked with his personal lawyer Rudy Giuliani said the president "knew exactly what was going on" in Ukraine. Giuliani, who has no official position, was heavily involved in US diplomacy with Ukraine and is said to have exerted pressure on the same matter.