"Anybody that wanted to sell on the idea that US tax reform was on its way was able to do that last week and get reasonable prices to readjust their positions," said Jim Vogel, interest rates strategist, at FTN Financial in Memphis, Tennessee.
"There's really no particular news. Anybody that really wants to nibble or add after the sell-off has to pay progressively higher prices," he added.
Euro zone government bond yields also slipped. A big win for Japanese Prime Minister Shinzo Abe's ruling bloc in a national election ensured the continuation of ultra-easy monetary policy in Japan and sets the stage for this week's ECB policy meeting.
Investors expect the ECB to flag a gradual approach in terms of removing monetary accommodation in the euro zone that has kept euro zone bond yields low for some time.
Market participants are also focused on this week's shorter-dated Treasury debt auctions. The Treasury is selling $26 billion in 2-year notes on Tuesday, $34 billion in 5-year notes and $15 billion in 2-year floating rate notes on Wednesday, and $28 billion in 7-year notes.
Since the September auction cycle, yields have moved higher as interest rate hike expectations for December have increased. This reflects the recent stronger US economic data as well as the Federal Reserve's increased hawkishness about the outlook
for interest rates.
"We expect to see relatively solid demand...at the auction as Treasuries have cheapened sharply on an outright basis across the curve," said TD Securities in a research note.
In late morning trading, 10-year US Treasury note prices were up 3/32, yielding 2.370 percent, down from Friday's 2.381 percent.
The 30-year bond prices rose 8/32, with a yield of 2.880 percent, down from 2.894 percent last Friday.
US two-year note yields, meanwhile, were at 1.564 percent , also down from 1.576 percent on Friday.