On 11 February 2022, Biden's national security advisor Jake Sullivan publicly warned about the likelihood of a Russian invasion of Ukraine prior to the end the 2022 Winter Olympics, urging all Americans to leave Ukraine immediately and indicating that there may be "no prospect of a U.S. military evacuation" once the invasion commences.[85] Sullivan downplayed comparisons of intelligence warnings of a possibly imminent Russian invasion of Ukraine to the lead-up to the 2003 invasion of Iraq, which was based on claims that Iraq possessed weapons of mass destruction.[86] Senior official of the Biden administration told reporters: "We are not basing our assessment of this on what the Russians say publicly.