“If this reporting is accurate, it appears that the DOJ and FBI have in their possession material relevant to our Committees’ ongoing investigation into collusive actions Chalupa and the DNC took to use foreign government sources to undermine the Trump campaign during the 2016 election,” Johnson and Grassley wrote.

Johnson, who chairs the Senate Homeland Security and Governmental Affairs Committee, and Grassley, who chairs the Senate Finance Committee, also sent a letter Thursday to the National Archives and Records Administration asking for records of any White House meetings in 2016 between Obama administration officials, representatives for the Ukrainian government and DNC officials.

House Democrats’ impeachment inquiry centers on evidence that Trump abused the power of his office to pressure Ukraine to investigate his political rivals.

As part of Trump’s defense, he and some Republicans have suggested that Ukraine’s government interfered in the 2016 election to help Hillary Clinton’s campaign. In September, Grassley and Johnson requested Barr investigate any ties between Clinton and Ukrainian operatives.

POLITICO reported in 2017 that some Ukrainian officials “helped Clinton’s allies research damaging information on Trump and his advisers,” but there’s no evidence of a top-down conspiracy to interfere in U.S. politics.

Chalupa told POLITICO in an interview this month that she is eager to testify and that her side of the story has been distorted.

