. >> host: maggie muller of the hill newspaper covers cybersecurity and is here to help us explore these issues. >> hello, professor brad thank you for being with us today. you noted that social media platforms need to spread the needle of securing data for making it more transparent in the lead up to the 2020 election how has social media pot forms such as facebook and twitter done in terms of addressing this vital balancing act? how are they prepared for 2020? >> guest: i will tell you two things. number one, we don't know enough about what is happening internally at these platforms to prepare for 2020. there hasn't been enough transparency simile and terms of policy. forget releasing data but we don't know what preparations are being made behind the scenes to prevent this manipulation and to protect election integrity in 2020. point number two is that it is a difficult problem but one that can be solved and i think that what i hear from a spark is that the people that are responsible for giving data to social science one are working around the clock and had people and computing resour

professor at mit in his article is in science magazine and you can find him on the mit website, maggie muller is with the hill. thank you both for being on "the communicators". all communicators are available as podcasts. >> the health impeachment panels starting to release transcripts from their investigation and today it was former u.s. of exeter to ukraine, you can find the entire released transcript online at c-span .org. "after words" house intelligence committee chair adam schiff spoke to reporters in the capital about the impeachment inquiry and he told reporters of those who failed to appear would be considered further evidence of the white house obstructing congress and its impeachment probe. >> good morning. today we had additional scheduled depositions with the top lawyer for the national security council as well as mr. blair from the office of management budget and i will work closely with mick mulvaney. both of them defied congressional subpoenas and refused to appear for their scheduled depositions. as has been the case with other witnesses who have done the same thing. this wil

professor at mit in his article is in science magazine and you can find him on the mit website, maggie muller is with the hill. thank you both for being on "the