President Barack Obama says the U.S. monitoring of Ebola must be "much more aggressive.' He says federal health teams must respond to future cases within 24 hours.

Obama says the second case of an infected nurse in Dallas highlights the need to ramp up efforts to confront the disease that has struck West Africa and has reached U.S. shores.

Obama spoke after meeting with top Cabinet officials involved in the Ebola response both here in the U.S. and in the West African region where the disease has been spreading at alarming rates.

Obama canceled a political campaign trip to convene the session.

He said his administration is reviewing what happened in Dallas to ensure it doesn't happen again

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