But the dollar and European stocks slipped, dented by uncertainty about whether Congress will approve the deal after a handful of hard-right Republican lawmakers said on Monday they would oppose the bill, though it is expected to pass.
The pan European STOXX 600 index (.STOXX) fell 0.2% after recording on Friday its biggest weekly decline in two months.
U.S. 10-year bond yields dropped 9.7 basis points to 3.72%, while 30-year yields fell 8 bps to 3.89%.
The dollar index , which measures the greenback against six peers, fell 0.26% at 104.03 after rising to a two-month high in earlier trading.
Elsewhere, euro zone bond yields fell after Spanish inflation data came in lower than expected, raising hopes that the European Central Bank may raise interest rates less than previously feared.