>> reporter: that's right. the number two at the cdc says limited testing and delayed travel alerts with europe helped drive the outbreak in the u.s. 2 million traveling from italy and other european countries in february. the ban didn't start until march 11th. she wrights, we clearly didn't realize the full import of this. david? >> tom, thank you. president trump is sharpening his criticism of china, after a u.s. intelligence report found china hid the severity of the outbreak and then hoarded vital medical supplies. so will the u.s. take action? here's jonathan karl. >> reporter: to presi...