As the 2011 Libyan Civil War progressed, the United States and its allies offered a choice for Colonel Muammar Gaddafi and his aides: step down from power or face an international response. Rice offered some of the toughest rhetoric toward Gaddafi, criticizing his denials of atrocities against his own citizens as "frankly, delusional." In a closed-door Security Council meeting in April 2011, Rice reportedly stated that Gaddafi loyalists engaged in atrocities, including terrorizing the population with sexual violence, and that Gaddafi's troops has been issued Viagra. Investigations by Amnesty International, Human Rights Watch and Doctors Without Borders contradicted Rice and stated they did not find first-hand evidence that mass rapes had occurred as Rice had claimed. Together with National Security Council figure Samantha Power, who already supported the U.S.-led military intervention in Libya, and Secretary of State Hillary Clinton, who came to support it, the three overcame internal opposition from Defense Secretary Robert Gates, security adviser Thomas E. Donilon, and counterterrorism adviser John Brennan, to have the administration advance a UN proposal to impose a no-fly zone over Libya and authorize other military actions as necessary.