"making a mess." let's see what he does with that opportunity this morning. cnn will have special coverage of this white house ceremony and all of pope francis's events throughout the day. tomorrow, "new day" will be live at the u.s. capitol. he's going to deliver his speech in english to the joint session of congress, alisyn. it's not his first language. he doesn't have a lot of comfort with it. will that change how spontaneous he can be? one way or another, everybody can understand it. >> we like people who mix it up. back to you in a moment, chris. first we need to talk about mixing it up on the campaign trail. ben carson and donald trump spending part of the last 24 hours trying to explain their stance on muslim-americans. can muslims serve as president and does donald trump still believe president obama is not american? athena jones live for us in washington with more. good morning. >> reporter: good morning, alisyn. trump defended himself again on