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"An early spike in oil markets was triggered by the news," said Kazuhiko Saito, chief analyst at commodities broker Fujitomi Co.
"But the rally was also driven by growing hopes that a US stimulus and easing of lockdowns will boost the economy and fuel demand," he said. WTI may be pulled back by profit-taking as it reached a key $60 level," he added.
US President Joe Biden pushed for the first major legislative achievement of his term on Friday, turning to a bipartisan group of local officials for help on his $1.9 trillion coronavirus relief plan.
Oil prices have rallied over recent weeks also as supplies tighten, due largely to production cuts from the Organization of the Petroleum Exporting Countries (OPEC) and allied producers in the group OPEC+.
"On top of that, robust global stock markets boosted investors' risk appetite," said Satoru Yoshida, a commodity analyst with Rakuten Securities.
Asian shares advanced to record highs on Monday as successful coronavirus vaccine rollouts globally raise hopes of a rapid economic recovery amid new financial aid from Washington.
"With cheap money supply amid monetary easing worldwide, the swift rollout of the vaccine, and tight supply from OPEC+ and U.S. shale oil producers, crude oil prices may be headed toward $70 a barrel," Yoshida said.