Hunter Biden was hired by a Romanian businessman accused of corruption who was trying to “influence U.S. government policy” during Joe Biden’s term as vice president, prosecutors said in court papers Wednesday.

Special counsel David Weiss’ team said Hunter Biden’s business associate will testify at the upcoming federal tax trial of the president’s son about the arrangement with the executive, Gabriel Popoviciu, who was facing criminal investigation at the time in Romania.

The allegations are likely to bring a fresh wave of criticism of Hunter Biden’s foreign business dealings, which have been the center of Republicans’ investigations into the president’s family. Hunter Biden has blasted Republican inquiries into his family’s business affairs as politically motivated, and has insisted he never involved his father in his business.