Obama: Fighting Ebola a Top Natl. Security Priority

President Obama addressed reporters after a national security briefing, emphasizing that fighting Ebola is a top national security priority. He reassured that an Ebola outbreak in the US is extremely rare but stressed the need for international cooperation. The US is also working on airline passenger screening protocols to prevent the spread of Ebola.

What measures is the US working on regarding airline passengers?

Why has airline passenger screening become a significant issue recently?