In the spring of 2020 the United States stepped up pressure on Maduro. On 26 March the United States accused President Nicolás Maduro of narcoterrorism and offered a $15 million reward for information leading to his arrest. In response, Maduro called US President Donald Trump a "racist cowboy". A few days later, Venezuelan Attorney General Tarek William Saab summoned opposition leader Juan Guaidó for questioning for an alleged "attempted coup d'etat" and "attempted assassination". On 31 March, United States Secretary of State Mike Pompeo said that sanctions did not apply to humanitarian aid during the health emergency and that the United States would lift its sanctions if Maduro agreed to organize elections that did not include Maduro in a period of six to twelve months and reiterated U.S. support for Guaidó. Then on 1 April President Trump announced that he was sending anti-drug Navy ships and AWACS planes to the region near Venezuela in one of the largest military build-ups in the region since the 1989 invasion of Panama to remove General Manuel Noriega from power.