From Matthew Graham at Mortgage News Daily: Mortgage Rates Steady at 4-Year Highs Despite Warning Shots

Mortgage rates were generally in line with Friday's latest levels today. Unfortunately, those happened to be the highest in more than 4 years.
...
Although bond markets received another warning shot with respect to increased supply today due to the unveiling of Trumps's new budget, market participants didn't do much with that information. Bonds were mostly unchanged as they wait for bigger, more important news like Wednesday morning's Consumer Price Index (inflation data). [30YR FIXED - 4.5%]
emphasis added
Tuesday:
• At 6:00 AM ET, NFIB Small Business Optimism Index for January.