Records obtained and released by House Republicans show that when Joe Biden was vice president in 2014, he emailed his son Hunter Biden's business associate 54 times.
Some of the emails were sent around the time when Joe Biden went to Ukraine and when Hunter was working for Burisma Holdings, a Ukrainian gas company, according to NBC News.
The records show the dates of the emails and who exchanged them, but does not include the text of the messages themselves.
A spokesperson declined to comment when NBC requested, but reportedly referred to House Democrats' statements that Eric Schwerin was President Biden's financial advisor between 2009 and 2017.
Last month, House Oversight Committee Chairman James Comer, R-Ky., and House Judiciary Committee Chairman Jim Jordan, R-Ohio, requested meetings with the leaders of Blue Star Strategies, a lobbying firm that did work for the Ukrainian energy firm that previously employed Hunter Biden.