Hunter Biden’s business in Ukraine caused George Kent, deputy assistant secretary for Europe and Eurasian, concern and he alerted President Obama’s administration in 2015 about possible conflicts of interest, but he was ignored.

Kent testified on Oct. 15 before Congress about the activities of then-Vice President Joe Biden’s son in an impeachment hearing conducted behind closed doors by Democratic lawmakers, according to The Washington Post.

He warned advisers Joe Biden’s staff about Hunter’s 2014 appointment as a member of the board of the Ukrainian natural gas company Burisma Holdings, but they ignored the report.

Kent’s statements indicate that investigations by Democrats into President Donald Trump’s conversation with the Ukrainian president also draws attention to the business of Joe Biden’s son, the 2020 U.S. presidential candidate, which could affect his campaign.

It is worth noting that Burisma Holdings was headed by a former government minister under investigation for possible corruption.

In addition, Hunter Biden earned up to $50,000 a month without any experience in either the energy sector or doing business in Ukraine.

He also received consulting fees from the Ukrainian corporation MBNA to work on “online banking issues,” while his father helped the credit card industry pass a law that made it difficult to file for bankruptcy protection, according to News Punch.

At the same time, he was conducting business with companies linked to the Chinese communist regime through his company Bohai Harvest RST, according to The Intercept. Hunter Biden himself admits that being Vice President Biden’s son helped get him the position on company board in Ukraine.

The White House emphatically denied that Trump had said anything inappropriate to the Ukrainian president and, in fact, published a transcript of the conversation held between President Trump and Ukraine’s president.

The conversation shows that President Trump did not put pressure on Ukraine to investigate Hunter Biden, who was involved in a corruption case of the country’s main gas company.