Mortgage rates were flat today. In fact, they were very close to being flat on the week for that matter! This is a reflection of the bond markets current set of concerns, which really came into focus late last week with Thursday's Brexit-related news and Friday's trade deal updates.
Brexit refers to the UK's attempts to exit the EU. As esoteric of a concern as that may seem, it's something that the bond market (and hence, interest rates) quite clearly cares about. Last Thursday's unexpected progress between Boris Johnson and Northern Ireland's Prime Minister sent rates screaming higher at their fastest pace in months. I could also argue that much of the damage that seemed to have been done by Friday's US/China trade news was instead follow-through momentum from Thursday's Brexit-inspired move.