Former acting Attorney General Sally Yates criticized President Trump for failing to definitively state that Russia interfered in the 2016 election and said his statements on Russian meddling are an insult to the intelligence community.

"POTUS' inexplicable refusal to confirm Russian election interference insults career intel pros & hinders our ability to prevent in future," Yates said on her Twitter account in her second tweet since becoming a private citizen.

During a news conference in Warsaw, Poland, on Thursday, Trump said he believes Russia and other countries meddled in the election.

"I think it could very well have been Russia, but I think it could well have been other countries," the president said.

Many Democrats criticized the president for his comments and said Trump was refuting his own intelligence community since four intelligence agencies concluded that Russia did attempt to influence the election.

Yates served as deputy attorney general during the Obama administration and became acting attorney general when Trump assumed the presidency.

Trump fired Yates on Jan. 30 after she instructed the Justice Department not to defend the president's first travel ban.