Documents released by the US Department of Justice on Saturday indicated that a top advisor to then-candidate Donald Trump said as early as the summer of 2016 that Ukraine, not Russia, was behind a hack of Democratic party emails. Trump and his surrogates have suggested that Kiev hacked Democratic National Committee servers and planted evidence to frame Russia, as a way of undermining the legitimacy of the US leader’s election. Trump has pressured Ukraine’s president to investigate his election rival Joe Biden -- a move at the crux of an impeachment investigation against him in the House of Representatives. The hundreds of pages of documents out Saturday were part of an initial tranche released to US media outlets Buzzfeed and CNN, which sued the government for access to notes from the investigation conducted by special counsel Robert Mueller into Russian meddling in the 2016 election. Installments of the internal documents from the Mueller probe, which concluded in March, will be released every month for the next eight years, Buzzfeed said.