The increase in USA production is not "a blip", Brouillette said.
Brent for April settlement was at US$65.57 a barrel on the London-based ICE Futures Europe exchange, down 10 cents.
A narrower premium of Brent to WTI means it is also less attractive for consumers in north-west Europe to import US crude, especially with refiners conducting maintenance.
Crude prices closed with a one-week gain on Friday, after losing over 12 percent in the first weeks of the month due to fears that growing USA production will exceed demand as expected by the International Energy Agency (IEA).
The WTI Crude Oil market rallied a bit during the day on Monday, as we continue to see a bit of a relief rally after the massive selloff.
The price for Brent, the global benchmark, topped $70 per barrel last month on the back of geopolitical risk and optimism over compliance with an effort by the Organization of Petroleum Exporting Countries to balance an oversupplied market with coordinated production cuts.
Ironically, this is all happening at the same time that the Nigerian government has pledged to participate in a global pact lead by Saudi Arabia and Russian Federation to restrict oil supply. But soaring USA production is threatening to erode those OPEC's efforts.
The American Petroleum Institute (API) is set to state its forecast regarding the USA crude supply on Wednesday. Should they continue their path of contributing to the global glut, allowing oil prices to remain low, breaking pacts, fostering mistrust with economic superpowers, and ramping up production just as the nation's biggest importers fall back, no one will be surprised if the next few years are tough for Nigerian oil. On Wednesday, the U.S. Bureau of Labor Statistics reported the consumer-price index, a gauge on the inflation in what consumers pay for everything from toothpaste to socks, increased 0.5 percent last month, after rising 0.2 percent in December.
Gold shed 0.3 percent to 1,342.07, while gold futures for the April contract fell by 0.8 percent to $1,344.60.
Gold has gained $112 an ounce since mid-December and despite culling positions in recent weeks large-scale speculators on derivatives markets like hedge funds have almost doubled net long positions - bets that gold will be more expensive in future - since then. European funds, added 7.6 tonnes, while Asian funds had net redemptions equal to 1.4 tonnes during the month. Platinum was up 0.2pc at $998.74, after earlier hitting $1,002.40.