A White House document obtained by the Washington Post shows executives from big oil companies met with Vice President Cheney’s energy task force in 2001. The documents appear to prove a suspicion long held by environmentalists and contradict testimony oil executives gave before Congress last week. The document shows representatives from Exxon Mobil, Conoco, Shell Oil and BP America met with Cheney aides responsible for developing a national energy policy. Some of their task force’s recommendations have become law while others have been held up in Congress. In testimony before the Senate Energy and Commerce committees last week, chief executives from Exxon, Chevron and ConocoPhillips denied their companies took part in the energy task force discussions. The White House has refused to release records of the meetings’ participants. A spokesperson for Vice President Cheney declined comment on the White House document. The executives were not sworn in for their testimony, and so cannot face perjury charges. Democratic Senator Frank Lautenberg of New Jersey said he will ask the Justice Department to investigate. Lautenberg told the Post: “The White House went to great lengths to keep these meetings secret, and now oil executives may be lying to Congress about their role in the Cheney task force.”