paula reed is at the white house. >> reporter: as details emerged about the london attack, presidentrump took to twitter. the we must stop being politically correct and get down to the business of security for our people. he took aim at london's mayor. at least seven dead and 48 wounded and terror attacks and mayor of london says there's no reason to be alarmed. mr. trump also pointed to the attack as a reason the courts need to approve his controversial travel ban. we need a travel ban as an extra level of safety. fran townsend says shared intelligence is essential is is is is to u.s. security. >> it will help us in understanding how this attack was executed to help protect americans at home. >> reporter: despite the president's insistence that a travel ban could help protect against further attacks, democrats disagree. >> i do believe that the very broad ban that he has proposed is not the right way to go. >> reporter: democrat mark warner. >> don't continue to call for this travel ban, which is frankly all of the leaders and the intelligence community have said would be a slap in

. >>> for more on this we are joined by paula reed who's at the white house. >> good morning. >> in terms of the invocation of executive privilege, we're getting reports from the new york city saying it's unlikely. >> reporter: we are told by some of comey's associates that he has received no invocation to protect certain conversations. he has publicly discussed these conversations, so at this point, we don't expect that the white house has not confirmed that he will invoke his executive privilege. >> could he, in fact, do this? there's a lot of argument about whether this is a legitimate use of executive privilege. >> he could certainly try. again, as opposed to describing it as legitimate or illegitimate, it's unprecedented to try to block a former official who wants to talk to congress about an issue of enormous public import. that's really an unprecedented move to try to block something like that. if he tries and comey wants to fight back, it would go before a judge and again it would be unprecedented for a judge to issue a restraining order against him. i

paula reed reporting that law enforcement officials telling cbs news at this point there are no links to terrorism. but the investigation is active and ongoing. that's not definitive. so important point at this moment. >> all right. let's go to nancy cordes on capitol hill. >> i can tell you this is going to have a chilling effect for every member of congress, and they normally feel quite free to walk around washington, d.c., and none of them, aside from the small group of members of congress who make up congressional leadership have security with them, and it's not unusual to see senator bernie sanders walking down the street with his laundry or senator ted cruz out to dinner. this is a small town in some ways, and there are a lot of members of congress. they go about their daily lives, not just here on capitol hill, in the capitol building, where there are capitol hill police officers stationed at every sblan entrance, but out in the wider community where until now they have not felt inhibited about going to the grocery store or to a baseball game or out to dinner. there's no questi