Hillary Clinton’s former presidential campaign chairman said Monday he supports a demand from presidential electors that they receive a secure intelligence briefing on how Russia may have helped President-elect Trump win the White House, before next week’s Electoral College vote next week.

“The bipartisan electors’ letter raises very grave issues involving our national security,” John Podesta said in a statement Monday, according to Politico. “Electors have a solemn responsibility under the Constitution and we support their efforts to have their questions addressed.”