WASHINGTON - President Barack Obama pledged on Wednesday that federal officials would oversee the response to US Ebola cases in a more aggressive way, and said the Centers for Disease Control would send a 'SWAT team' to any hospital encountering a new case of the disease. After meeting with his cabinet for about two hours, Obama emphasized that the likelihood of a widespread Ebola outbreak in the United States was 'very, very low' but said the international community must do more to help African nations struggling to control the epidemic.