Joe Biden's national security adviser pick defended the anti-Trump dossier in 2018 as "perfectly appropriate."
Many news outlets have declared Biden the president-elect. Newsmax has yet to project a winner, citing legal challenges in several key battleground states.
Jake Sullivan, who worked for Biden when he served as vice president in the Obama administration and as a senior foreign policy adviser to Hillary Clinton during her presidential race in 2016, made the comments on a podcast interview with David Axelrod, the chief strategist for Obama's presidential campaigns.
"I mean, I believe that it is perfectly appropriate and responsible if we get wind, or if people associated with the campaign get wind, that there may be real questions about the connections between Donald Trump, his organization, his campaign and Russia that that be explored fully," he said at the time, The Daily Caller reported.
Sullivan worked for Clinton when a law firm representing her campaign hired an opposition research firm to investigate Trump's possible ties to Russia. The firm hired Christopher Steele, the author behind the dossier alleging a "well-developed conspiracy of cooperation between the Trump campaign and Russian government."
Special counsel Robert Mueller later found those claims to be unfounded during his probe into Russian interference in the election, writing in his report "the investigation did not establish that members of the Trump campaign conspired or coordinated with the Russian government in its election interference activities."