Ukrainian anti-corruption authorities said Friday they are investigating Donald Trump's campaign chairman over allegations related to his work on behalf of a pro-Russian political party.
Paul Manafort "is among those names on the list of the so-called 'black ledger' of the Party of Regions," the National Anti-Corruption Bureau said in a statement, confirming earlier media reports.
The documents allegedly show funds allocated to Manafort totaling more than 12.7 million dollars between November 2007 and October 2012. But the agency emphasized that it had not determined whether he had actually received that money.
Manafort has denied any wrongdoing and says he never received any off-the-books cash payments or worked directly for the governments of Ukraine and Russia.
Party of Regions was Ukraine's ruling political party until Kremlin-friendly president Viktor Yanukovych was ousted in early 2014 amid mass protests calling for closer ties with the West.
Russia responded to the ouster by occupying and annexing Ukraine's southern Crimea region and supporting a pro-Russian separatist rebellion in Ukraine's two eastern-most regions.
During his campaign, Trump has expressed approval of Russia's annexation of Crimea and positive sentiment for Russian President Vladimir Putin, calling him "highly respected."