Bearing in mind that the issue of a W.E.Coyote moment for the dollar has been being debated since a long, really long time ago and that Sean Duffy is a republican and therefore most likely a person politicizing such issue on Fox News I did not even bother to watch the video.
W.E.Coyote moment: the moment when the cartoon character, who has run off a cliff, looks down and realizes that he's standing on thin air - and plunges. In this case, investors suddenly realize that Stein's Law applies - "If something cannot go on forever, it will stop" .
If interested, for access to a paper by economist Paul Krugman about this issue you can use the link bellow.