I downloaded the Pelosi cspan video to local disk using this site/tool https:// video-download.co/site/CSpan
Pelosi admits she's traveled to NK at time 12:59
While Pelosi is continuing talking about her travel to NK, at 13:09 and 13:11 there are two, respectively, relatively clear whistle tweet sounds in the audio. Perhaps it's her handler trying to get her attention and stop her. I wonder if this whistle sound can be heard on other Pelosi occasions i.e. if her handler has had to use this same method at other times to get her attention.