Hillary Clinton questioned the legitimacy of President Trump’s election, but conceded that there’s no method to contest the election results.

“I think there are lots of questions about [the election’s] legitimacy and we don’t have a method for contesting that in our system,” Clinton told Mother Jones in an interview published Friday. “That’s why I’ve long advocated for an independent commission to get to the bottom of what happened.”

Clinton warned that Russian interference in the U.S. elections is not going to stop until Russia suffers consequences for its meddling and the U.S. learns “how to protect ourselves” from such attacks.

She also pointed to special counsel Robert Mueller’s investigation into Russia’s meddling and possible collusion with the Trump campaign.

“I think as we learn more about it, we know that the web of connections between people on Trump’s team and Russian representatives just gets more and more dense,” Clinton said.

Former Trump campaign chairman Paul Manafort and his business associate Rick Gates were indicted last month on charges of money laundering, tax fraud, and conspiracy against the United States.

Former Trump campaign policy adviser George Papadopoulos pleaded guilty in early October to lying to FBI agents about his contacts with Russians during the campaign.

Clinton told Mic in September that she did not plan on contesting the legitimacy of the election.

“I think no one, including me, is saying we will contest the election,” she said. “I’m in the very large group of people who believe that, you know, there’s no legal basis, no constitutional basis for that.”

She added, however, that depending on the results of Mueller’s investigation, there would be “millions” of Americans who would raise questions about the legitimacy of the election.